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Tag: Planets

  • Mysterious dark matter may be better understood through a new map of far-off galaxies

    NEW YORK — A new high-resolution map of distant galaxies may help scientists understand a mysterious invisible substance that helps hold the universe together.

    The ordinary matter all around us — stars, planets and people — makes up just 5% of the universe. For decades, researchers have hoped to demystify what’s known as dark matter, a material that comprises just over a quarter of our universe. Another equally mysterious force called dark energy makes up the rest.

    Dark matter doesn’t absorb or give off light so scientists can’t study it directly. But they can observe how its gravity warps and bends the star stuff around it — for example, the light from distant galaxies. By studying these distortions across large swathes of the universe, scientists can get closer to unmasking dark matter and its various hiding places.

    The latest map, created with images from NASA’s James Webb Space Telescope, is the most detailed yet over such a large patch of sky. It has twice the resolution of previous attempts using the Hubble Space Telescope and captures hundreds of thousands of galaxies over the past 10 billion years.

    “Now, we can see everything more clearly,” said study author Diana Scognamiglio with NASA’s Jet Propulsion Laboratory.

    The latest map, published Monday in the journal Nature Astronomy, includes information on new galaxy clusters and the strands of dark matter that connect them. Piece by piece, these structures help form the skeleton of the universe. Scientists can study this map to see how dark matter has clumped up over billions of years.

    Dark matter doesn’t have much of an impact on your midday lunch order or your nightly bedtime ritual. But it silently passes through your body all the time and has shaped the universe.

    As humans, we’re naturally curious to know more about where we come from and that story can’t be told without dark matter, said astrophysicist Rutuparna Das with the Harvard-Smithsonian Center for Astrophysics

    “Our home is the universe and we want to understand what the nature of it is,” said Das, who was not involved with the new study.

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    The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

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  • Study shows how earthquake monitors can track space junk through sonic booms

    CAPE CANAVERAL, Fla. — As more and more space junk comes crashing down, a new study shows how earthquake monitors can better track incoming objects by tuning into their sonic booms.

    Scientists reported Thursday that seismic readings from sonic booms that were generated when a discarded module from a Chinese crew capsule reentered over Southern California in 2024 allowed them to place the object’s path nearly 20 miles (30 kilometers) farther south than radar had predicted from orbit.

    Using this method to track uncontrolled objects plummeting at supersonic speeds, they said, could help recovery teams reach any surviving pieces more quickly — crucial if the debris is dangerous.

    “The problem at the moment is we can track stuff very well in space,” said Johns Hopkins University’s Benjamin Fernando, the lead researcher. “But once it gets to the point that it’s actually breaking up in the atmosphere, it becomes very difficult to track.”

    His team’s findings, published in the journal Science, focus on just one debris event. But the researchers already have used publicly available data from seismic networks to track a few dozen other reentries, including debris from three failed SpaceX Starship test flights in Texas.

    A growing concern among scientists and others is that falling space debris could strike a plane in flight.

    “There are thousands, tens of thousands, more satellites in orbit than there were 10 years ago,” including SpaceX’s Starlinks and other companies’ internet satellites, said Fernando. “Unfortunately, we don’t really have anything other than the word of the company to say that when they break up, they completely burn up in the atmosphere.”

    Fernando, who normally studies quakes on the moon and Mars, teamed up with Imperial College London’s Constantinos Charalambous the day after the Chinese debris streaked across the California sky in 2024. Over time, they gathered data from more than 120 seismometers that captured the sonic booms from the reentry, using that data to plot the object’s suspected path.

    China’s out-of-control module had been abandoned in a decaying orbit ever since it was cut loose from the Shenzhou-15 capsule returning three Chinese astronauts from their country’s space station in 2023. The 1.5-ton (1.36-metric tonne) module — more than 3 feet (1 meter) in size — broke into countless smaller pieces as it plummeted through the atmosphere, resulting in multiple sonic booms. Besides attempting to trace the object’s fall, the seismic readings provided a sense of the cascading breakup, Fernando said.

    Fernando acknowledged it’s impossible to know how close his team’s predictions are to the actual path since no debris was reported on the ground.

    The goal is to ascertain, within minutes or even seconds, the speed and direction of the incoming space junk as well as its fragmentation. In remote areas like the South Pacific, nuclear blast monitoring stations could potentially track the sonic booms to fine-tune the paths of descent. That’s where NASA plans to ditch the International Space Station in five years. SpaceX is working on the deorbiting vehicle to ensure a controlled entry.

    Fernando is looking to eventually publish a catalog of seismically tracked, entering space objects, while improving future calculations by factoring in the wind’s effect on falling debris.

    In a companion article in Science, Los Alamos National Laboratory’s Chris Carr, who was not involved in the study, said further research is needed to reduce the time between an object’s final plunge and the determination of its course.

    For now, Carr said this new method “unlocks the rapid identification of debris fall-out zones, which is key information as Earth’s orbit is anticipated to become increasingly crowded with satellites, leading to a greater influx of space debris.”

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    The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

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  • NASA sends 4 astronauts back to Earth in first medical evacuation

    CAPE CANAVERAL, Fla. — An astronaut in need of doctors’ care departed the International Space Station with three crewmates on Wednesday in NASA’s first medical evacuation.

    The four returning astronauts — from the U.S., Russia and Japan — are aiming for an early Thursday morning splashdown in the Pacific near San Diego with SpaceX. The decision cuts short their mission by over a month.

    “Our timing of this departure is unexpected,” NASA astronaut Zena Cardman said before the return trip, “but what was not surprising to me was how well this crew came together as a family to help each other and just take care of each other.”

    Officials refused to identify the astronaut who needed care last week and would not divulge the health concerns.

    The ailing astronaut is “stable, safe and well cared for,” outgoing space station commander Mike Fincke said earlier this week via social media. “This was a deliberate decision to allow the right medical evaluations to happen on the ground, where the full range of diagnostic capability exists.”

    Launched in August, Cardman, Fincke, Japan’s Kimiya Yui and Russia’s Oleg Platonov should have remained on the space station until late February. But on Jan. 7, NASA abruptly canceled the next day’s spacewalk by Cardman and Fincke and later announced the crew’s early return. Officials said the health problem was unrelated to spacewalk preparations or other station operations, but offered no other details, citing medical privacy. They stressed it was not an emergency situation.

    NASA said it would stick to the same entry and splashdown procedures at flight’s end, with the usual assortment of medical experts aboard the recovery ship in the Pacific. It was another middle-of-the-night crew return for SpaceX, coming less than 11 hours after undocking from the space station. NASA said it was not yet known how quickly all four would be flown from California to Houston, home to Johnson Space Center and the base for astronauts.

    One U.S. and two Russian astronauts remain aboard the orbiting lab, just 1 1/2 months into an eight-month mission that began with a Soyuz rocket liftoff from Kazakhstan. NASA and SpaceX are working to move up the launch of a fresh four-person crew from Florida, currently targeted for mid-February.

    Computer modeling predicted a medical evacuation from the space station every three years, but NASA hasn’t had one in its 65 years of human spaceflight. The Russians have not been as fortunate. In 1985, Soviet cosmonaut Vladimir Vasyutin came down with a serious infection or related illness aboard his country’s Salyut 7 space station, prompting an early return. A few other Soviet cosmonauts encountered less serious health issues that shortened their flights.

    It was the first spaceflight for Cardman, a 38, biologist and polar explorer who missed out on spacewalking, as well as Platonov, 39, a former fighter pilot with the Russian Air Force who had to wait a few extra years to get to space because of an undisclosed health issue. Cardman should have launched last year but was bumped to make room on the way down for NASA’s Butch Wilmore and Suni Williams, who were stuck nearly a year at the space station because of Boeing’s capsule problems.

    Fincke, 58, a retired Air Force colonel, and Yui, 55, a retired fighter pilot with the Japan Air Self-Defense Force, were repeat space fliers. Finke has spent 1 1/2 years in orbit over four missions and conducted nine spacewalks on previous flights, making him one of NASA’s top performers. Last week, Yui celebrated his 300th day in space over two station stays, sharing stunning views of Earth, including Japan’s Mount Fuji and breathtaking auroras.

    “I want to burn it firmly into my eyes, and even more so, into my heart,” Yui said on the social platform X. “Soon, I too will become one of those small lights on the ground.”

    NASA officials had said it was riskier to leave the astronaut in space without proper medical attention for another month than to temporarily reduce the size of the space station crew by more than half. Until SpaceX delivers another crew, NASA said it will have to stand down from any routine or even emergency spacewalks, a two-person job requiring backup help from crew inside the orbiting complex.

    The medical evacuation was the first major decision by NASA’s new administrator Jared Isaacman. The billionaire founder of a payment processing company and two-time space flier assumed the agency’s top job in December.

    “The health and the well-being of our astronauts is always and will be our highest priority,” Isaacman said in announcing the decision last week.

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    The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

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  • The year’s first meteor shower and supermoon clash in January skies

    NEW YORK — The year’s first supermoon and meteor shower will sync up in January skies, but the light from one may dim the other.

    The Quadrantid meteor shower peaks Friday night into Saturday morning, according to the American Meteor Society. In dark skies during the peak, skygazers typically see around 25 meteors per hour, but this time they’ll likely glimpse less than 10 per hour due to light from Saturday’s supermoon.

    “The biggest enemy of enjoying a meteor shower is the full moon,” said Mike Shanahan, planetarium director at Liberty Science Center in New Jersey.

    Meteor showers happen when speedy space rocks collide with Earth’s atmosphere, burning up and leaving fiery tails in their wake — the end of a “shooting star.” A handful of meteors are visible on any given night, but predictable showers appear annually when Earth passes through dense streams of cosmic debris.

    Supermoons occur when a full moon is closer to Earth in its orbit. That makes it appear up to 14% bigger and 30% brighter than the faintest moon of the year, according to NASA. That difference can be tough to notice with the naked eye.

    Supermoons, like all full moons, are visible in clear skies everywhere that it’s night. The Quadrantids, on the other hand, can be seen mainly from the Northern Hemisphere. Both can be glimpsed without any special equipment.

    To spot the Quadrantids, venture out in the early evening away from city lights and watch for fireballs before the moon crashes the party, said Jacque Benitez with the Morrison Planetarium at the California Academy of Sciences. Skygazers can also try looking during early dawn hours on Sunday.

    Wait for your eyes to get used to the darkness, and don’t look at your phone. The space rocks will look like fast-moving white dots and appear over the whole sky.

    Meteor showers are named for the constellation where the fireballs appear to come from. The Quadrantids — space debris from the asteroid 2003 EH1 — are named for a constellation that’s no longer recognized.

    The next major meteor shower, called the Lyrids, is slotted for April.

    Supermoons happen a few times a year and come in groups, taking advantage of the sweet spot in the moon’s elliptical orbit. Saturday night’s event ends a four-month streak that started in October. There won’t be another supermoon until the end of 2026.

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    The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

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  • The moon and sun figure big in the new year’s lineup of cosmic wonders

    CAPE CANAVERAL, Fla. — The moon and sun share top billing in 2026.

    Kicking off the year’s cosmic wonders is the moon, drawing the first astronauts to visit in more than 50 years as well as a caravan of robotic lunar landers including Jeff Bezos’ new supersized Blue Moon. A supermoon looms on Jan. 3 and an astronomical blue moon is on the books for May.

    The sun will also generate buzz with a ring-of-fire eclipse at the bottom of the world in February and a total solar eclipse at the top of the world in August. Expect more auroras in unexpected places, though perhaps not as frequently as the past couple years.

    And that comet that strayed into our turf from another star? While still visible with powerful backyard telescopes, the recently discovered comet known as 3I/Atlas is fading by the day after swinging past Earth in December. Jupiter is next on its dance card in March. Once the icy outsider departs our solar system a decade from now, it will be back where it belongs in interstellar space.

    It’s our third known interstellar visitor. Scientists anticipate more.

    “I can’t believe it’s taken this long to find three,” said NASA’s Paul Chodas, who’s been on the lookout since the 1980s. And with ever better technology, “the chance of catching another interstellar visitor will increase.”

    Here’s a rundown on what the universe has in store for us in 2026:

    NASA’s upcoming moonshot commander Reid Wiseman said there’s a good chance he and his crew will be the first to lay eyeballs on large swaths of the lunar far side that were missed by the Apollo astronauts a half-century ago. Their observations could be a boon for geologists, he noted, and other experts picking future landing sites.

    Launching early in the year, the three Americans and one Canadian will zip past the moon, do a U-turn behind it, then hustle straight back to Earth to close out their 10-day mission. No stopping for a moonwalk — the boot prints will be left by the next crew in NASA’s Artemis lunar exploration program.

    More robotic moon landings are on the books by China as well as U.S. companies. Early in the year, Amazon founder Bezos is looking for his Blue Origin rocket company to launch a prototype of the lunar lander it’s designing for NASA’s astronauts. This Blue Moon demo will stand 26 feet (8 meters), taller than what delivered Apollo’s 12 moonwalkers to the lunar surface. The Blue Moon version for crew will be almost double that height.

    Back for another stab at the moon, Astrobotic Technology and Intuitive Machines are also targeting 2026 landings with scientific gear. The only private entity to nail a lunar landing, Firefly Aerospace, will aim for the moon’s far side in 2026.

    China is targeting the south polar region in the new year, sending a rover as well as a so-called hopper to jump into permanently shadowed craters in search of ice.

    The cosmos pulls out all the stops with a total solar eclipse on Aug. 12 that will begin in the Arctic and cross over Greenland, Iceland and Spain. Totality will last two minutes and 18 seconds as the moon moves directly between Earth and the sun to blot out the latter. By contrast, the total solar eclipse in 2027 will offer a whopping 6 1/2 minutes of totality and pass over more countries.

    For 2026, the warm-up act will be a ring-of-fire eclipse in the Antarctic on Feb. 17, with only a few research stations in prime viewing position. South Africa and southernmost Chile and Argentina will have partial viewing. A total lunar eclipse will follow two weeks after February’s ring of fire, with a partial lunar eclipse closing out the action at the end of August.

    Six of the solar system’s eight planets will prance across the sky in a must-see lineup around Feb. 28. A nearly full moon is even getting into the act, appearing alongside Jupiter. Uranus and Neptune will require binoculars or telescopes. But Mercury, Venus, Jupiter and Saturn should be visible with the naked eye shortly after sunset, weather permitting, though Mercury and Venus will be low on the horizon.

    Mars will be the lone no-show. The good news is that the red planet will join a six-planet parade in August, with Venus the holdout.

    Three supermoons will lighten up the night skies in 2026, the stunning result when a full moon inches closer to Earth than usual as it orbits in a not-quite-perfect circle. Appearing bigger and brighter, supermoons are a perennial crowd pleaser requiring no equipment, only your eyes.

    The year’s first supermoon in January coincides with a meteor shower, but the moonlight likely will obscure the dimmer fireballs. The second supermoon of 2026 won’t occur until Nov. 24, with the third — the year’s final and closest supermoon — occurring the night of Dec. 23 into Dec. 24. This Christmas Eve supermoon will pass within 221,668 miles (356,740 kilometers) of Earth.

    The sun is expected to churn out more eruptions in 2026 that could lead to geomagnetic storms here on Earth, giving rise to stunning aurora. Solar action should start to ease, however, with the 11-year solar cycle finally on the downslide.

    Space weather forecasters like Rob Steenburgh at the National Oceanic and Atmospheric Administration can’t wait to tap into all the solar wind measurements coming soon from an observatory launched in the fall.

    “2026 will be an exciting year for space weather enthusiasts,” he said in an email, with this new spacecraft and others helping scientists “better understand our nearest star and forecast its impacts.”

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    The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

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  • Starlink in the crosshairs: How Russia could attack Elon Musk’s conquering of space

    Two NATO-nation intelligence services suspect Russia is developing a new anti-satellite weapon to target Elon Musk’s Starlink constellation with destructive orbiting clouds of shrapnel, with the aim of reining in Western space superiority that has helped Ukraine on the battlefield.

    Intelligence findings seen by The Associated Press say the so-called “zone-effect” weapon would seek to flood Starlink orbits with hundreds of thousands of high-density pellets, potentially disabling multiple satellites at once but also risking catastrophic collateral damage to other orbiting systems.

    Analysts who haven’t seen the findings say they doubt such a weapon could work without causing uncontrollable chaos in space for companies and countries, including Russia and its ally China, that rely on thousands of orbiting satellites for communications, defense and other vital needs.

    Such repercussions, including risks to its own space systems, could steer Moscow away from deploying or using such a weapon, analysts said.

    “I don’t buy it. Like, I really don’t,” said Victoria Samson, a space-security specialist at the Secure World Foundation who leads the Colorado-based nongovernmental organization’s annual study of anti-satellite systems. “I would be very surprised, frankly, if they were to do something like that.”

    But the commander of the Canadian military’s Space Division, Brig. Gen. Christopher Horner, said such Russian work cannot be ruled out in light of previous U.S. allegations that Russia also has been pursuing an indiscriminate nuclear, space-based weapon.

    “I can’t say I’ve been briefed on that type of system. But it’s not implausible,” he said. “If the reporting on the nuclear weapons system is accurate and that they’re willing to develop that and willing to go to that end, well it wouldn’t strike me as shocking that something just short of that, but equally damaging, is within their wheelhouse of development.”

    Kremlin spokesman Dmitry Peskov didn’t respond to messages from the AP seeking comment. Russia has previously called for United Nations efforts to stop the orbital deployment of weapons and President Vladimir Putin has said Moscow has no intention of deploying nuclear space weapons.

    The intelligence findings were shown to the AP on condition that the services involved were not identified and the news organization was not able to independently verify the findings’ conclusions.

    The U.S. Space Force didn’t respond to e-mailed questions. The French military’s Space Command said in a statement to the AP that it could not comment on the findings but said, “We can inform you that Russia has, in recent years, been multiplying irresponsible, dangerous, and even hostile actions in space.”

    Russia views Starlink in particular as a grave threat, the findings indicate. The thousands of low-orbiting satellites have been pivotal for Ukraine’s survival against Russia’s full-scale invasion, now in its fourth year.

    Starlink’s high-speed internet service is used by Ukrainian forces for battlefield communications, weapons targeting and other roles and by civilians and government officials where Russian strikes have affected communications.

    Russian officials repeatedly have warned that commercial satellites serving Ukraine’s military could be legitimate targets. This month, Russia said it has fielded a new ground-based missile system, the S-500, which is capable of hitting low-orbit targets.

    Unlike a missile that Russia tested in 2021 to destroy a defunct Cold War-era satellite, the new weapon in development would target multiple Starlinks at once, with pellets possibly released by yet-to-be launched formations of small satellites, the intelligence findings say.

    Canada’s Horner said it is hard to see how clouds of pellets could be corralled to only strike Starlink and that debris from such an attack could get “out of control in a hurry.”

    “You blow up a box full of BBs,” he said. Doing that would “blanket an entire orbital regime and take out every Starlink satellite and every other satellite that’s in a similar regime. And I think that’s the part that is incredibly troubling.”

    The findings seen by the AP didn’t say when Russia might be capable of deploying such a system nor detail whether it has been tested or how far along research is believed to be.

    The system is in active development and information about the timing of an expected deployment is too sensitive to share, according to an official familiar with the findings and other related intelligence that the AP did not see. The official spoke on condition of anonymity to discuss the nonpublic findings.

    Such Russian research could be simply experimental, Samson said.

    “I wouldn’t put it past some scientists … to build out something like this because it’s an interesting thought-experiment and they think, you know, ‘Maybe at some point we can get our government to pay for it,’” she said.

    Samson suggested the specter of a supposed new Russian threat may also be an effort to elicit an international response.

    “Often times people pushing these ideas are doing it because they want the U.S. side to build something like that or … to justify increased spending on counterspace capabilities or using it for a more hawkish approach on Russia,” she said.

    “I’m not saying that this is what’s happening with this,” Samson added. “But it has been known to happen that people take these crazy arguments and use them.”

    The intelligence findings say the pellets would be so small — just millimeters across — that they would evade detection by ground- and space-based systems that scan for space objects, which could make it hard to pin blame for any attack on Moscow.

    Clayton Swope, who specializes in space security and weaponry at the Center for Strategic and International Studies, a Washington, D.C.-based security and policy think tank, said if “the pellets are not trackable, that complicates things” but “people would figure it out.”

    “If satellites start winking out with damage, I guess you could put two and two together,” he said.

    Exactly how much destruction tiny pellets could do isn’t clear. In November, a suspected impact by a small piece of debris was sufficient to damage a Chinese spacecraft that was meant to bring three astronauts back to the Earth.

    “Most damage would probably be done to the solar panels because they’re probably the most fragile part” of satellites, Swope said. “That’d be enough, though, to damage a satellite and probably bring it offline.”

    After such an attack, pellets and debris would over time fall back toward Earth, possibly damaging other orbiting systems on their way down, analysts say.

    Starlink’s orbits are about 550 kilometers (340 miles) above the planet. China’s Tiangong space station and the International Space Station operate at lower orbits, “so both would face risks,” according to Swope.

    The space chaos that such a weapon could cause might enable Moscow to threaten its adversaries without actually having to use it, Swope said.

    “It definitely feels like a weapon of fear, looking for some kind of deterrence or something,” he said.

    Samson said the drawbacks of an indiscriminate pellet-weapon could steer Russia off such a path.

    “They’ve invested a huge amount of time and money and human power into being, you know, a space power,” she said.

    Using such a weapon “would effectively cut off space for them as well,” Samson said. ”I don’t know that they would be willing to give up that much.”

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    Emma Burrows in London contributed to this report.

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  • Catch the Ursid meteor shower as it peaks just before Christmas

    NEW YORK — The last major meteor shower of the year, known as the Ursids, peaks soon, bringing glowing streaks to nighttime and early morning skies. Compared to other meteor showers, it’s more subdued, but experts say it’s still worth a glimpse.

    Meteor showers happen when space rocks hit Earth’s atmosphere at extremely high speeds and burn up, gaining fiery tails — the end of a “shooting star.” Random meteors are visible from Earth on any given clear night, but more predictable meteor showers happen yearly when Earth passes through streams of cosmic leftovers from comets or asteroids.

    The Ursids peak Sunday night into Monday morning and will be visible until Dec. 26 from the Northern Hemisphere. Skygazers usually see five to 10 meteors per hour during the height and there’s a possibility for outbursts of up to 25 meteors per hour, according to the American Meteor Society.

    How active a shower will appear from Earth depends on the amount of debris and the moon’s brightness, which can blot out glowing meteors. The Ursids feature less space debris than other showers like the Geminids, but the narrow crescent moon won’t be much of an obstacle when they peak.

    No special equipment is needed to view a meteor shower. To see the Ursids, which hail from a comet called 8P/Tuttle, bundle up and get away from city lights.

    “The darker your sky, the better the shower is going to be,” said astronomer Peter Brown with Western University in Canada.

    The meteors can be seen over the whole sky, but all the streaks will seem to come from a central point near a constellation for which the shower is named. In this case, that’s the constellation Ursa Minor, also known as the Little Dipper.

    Once it gets dark, avoid bright lights from cellphones, which will make it harder for your eyes to adjust.

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    The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

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  • Shortest day of the year descending on Northern Hemisphere: what to know

    Yes the darkest day of the year is here, but that means brighter days are ahead.

    Sunday is the shortest day of the year north of the equator, where the solstice marks the start of astronomical winter. It’s the opposite in the Southern Hemisphere, where it is the longest day of the year and summer will start.

    The word “solstice” comes from the Latin words “sol” for sun and “stitium” which can mean “pause” or “stop.” The solstice is an end of the sun’s annual march higher or lower in the sky. The winter solstice is when the sun makes its shortest, lowest arc. The good news for sun lovers: It then starts climbing again and days will get a little longer every day until late June.

    People have marked solstices for eons with celebrations and monuments such as Stonehenge, which was designed to align with the sun’s paths at the solstices. But what is happening in the heavens? Here’s what to know about the Earth’s orbit.

    As the Earth travels around the sun, it does so at an angle, making the sun’s warmth and light fall unequally on the northern and southern halves of the planet for most of the year.

    The solstices mark the times when the Earth’s tilt toward or away from the sun is at its maximum. This means the hemispheres are getting very different amounts of sunlight — and days and nights are at their most unequal.

    At the Northern Hemisphere’s winter solstice the upper half of the Earth is at its furthest lean away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls can fall between Dec. 20 and 23 — this year it’s the 21st.

    The opposite happens at a Northern Hemisphere summer solstice: The upper half of the Earth is leaning toward the sun, creating the longest day and shortest night of the year. This solstice falls between June 20 and 22.

    During the equinox, the Earth’s axis and its orbit align so that both hemispheres get an equal amount of sunlight.

    The word equinox comes from two Latin words meaning equal and night. That’s because on the equinox, day and night last almost the same amount of time — though one may get a few extra minutes, depending on where you are on the planet.oo

    The Northern Hemisphere’s fall — or autumnal — equinox can land between Sept. 21 and 24, depending on the year. Its spring — or vernal — equinox can land between March 19 and 21.

    These are just two different ways to carve up the year.

    While astronomical seasons depend on how the Earth moves around the sun, meteorological seasons are defined by the weather. Meteorologists break down the year into three-month seasons based on annual temperature cycles. By that calendar, spring starts on March 1, summer on June 1, fall on Sept. 1 and winter on Dec. 1.

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    The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.

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  • Saturn’s moon Titan may not have a buried ocean as long suspected, new study suggests

    CAPE CANAVERAL, Fla. — Saturn’s giant moon Titan may not have a vast underground ocean after all.

    Titan instead may hold deep layers of ice and slush more akin to Earth’s polar seas, with pockets of melted water where life could possibly survive and even thrive, scientists reported Wednesday.

    The team led by researchers at NASA’s Jet Propulsion Laboratory challenged the decade-long assumption of a buried global ocean at Titan after taking a fresh look at observations made years ago by NASA’s Cassini spacecraft around Saturn.

    They stress that no one has found any signs of life at Titan, the solar system’s second largest moon spanning 3,200 miles (5,150 kilometers) and brimming with lakes of liquid methane on its frosty surface.

    But with the latest findings suggesting a slushy, near-melting environment, “there is strong justification for continued optimism regarding the potential for extraterrestrial life,” said the University of Washington’s Baptiste Journaux, who took part in the study published in the journal Nature.

    As to what form of life that might be, possibly strictly microscopic, “nature has repeatedly demonstrated far greater creativity than the most imaginative scientists,” he said in an email.

    JPL’s Flavio Petricca, the lead author, said Titan’s ocean may have frozen in the past and is currently melting, or its hydrosphere might be evolving toward complete freezing.

    Computer models suggest these layers of ice, slush and water extend to a depth of more than 340 miles (550 kilometers). The outer ice shell is thought to be about 100 miles (170 kilometers) deep, covering layers of slush and pools of water that could go down another 250 miles (400 kilometers). This water could be as warm as 68 degrees Fahrenheit (20 degrees Celsius).

    Because Titan is tidally locked, the same side of the moon faces Saturn all the time, just like our own moon and Earth. Saturn’s gravitational pull is so intense that it deforms the moon’s surface, creating bulges as high as 30 feet (10 meters) when the two bodies are closest.

    Through improved data processing, Petricca and his team managed to measure the timing between the peak gravitational tug and the rising of Titan’s surface. If the moon held a wet ocean, the effect would be immediate, Petricca said, but a 15-hour gap was detected, indicating an interior of slushy ice with pockets of liquid water. Computer modeling of Titan’s orientation in space supported their theory.

    Sapienza University of Rome’s Luciano Iess, whose previous studies using Cassini data indicated a hidden ocean at Titan, is not convinced by the latest findings.

    While “certainly intriguing and will stimulate renewed discussion … at present, the available evidence looks certainly not sufficient to exclude Titan from the family of ocean worlds,” Iess said in an email.

    NASA’s planned Dragonfly mission — featuring a helicopter-type craft due to launch to Titan later this decade — is expected to provide more clarity on the moon’s innards. Journaux is part of that team.

    Saturn leads the solar system’s moon inventory with 274. Jupiter’s moon Ganymede is just a little larger than Titan, with a possible underground ocean. Other suspected water worlds include Saturn’s Enceladus and Jupiter’s Europa, both of which are believed to have geysers of water erupting from their frozen crusts.

    Launched in 1997, Cassini reached Saturn in 2004, orbiting the ringed planet and flying past its moons until deliberately plunging through Saturn’s atmosphere in 2017.

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  • Interstellar comet keeps its distance as it makes its closest approach to Earth

    CAPE CANAVERAL, Fla. — A stray comet from another star swings past Earth this week in one last hurrah before racing back toward interstellar space.

    Discovered over the summer, the comet known as 3I/Atlas will pass within 167 million miles (269 million kilometers) of our planet on Friday, the closest it gets on its grand tour of the solar system.

    NASA continues to aim its space telescopes at the visiting ice ball, estimated to be between 1,444 feet (440 meters) and 3.5 miles (5.6 kilometers) in size. But it’s fading as it exits, so now’s the time for backyard astronomers to catch it in the night sky with their telescopes.

    The comet will come much closer to Jupiter in March, zipping within 33 million miles (53 million kilometers). It will be the mid-2030s before it reaches interstellar space, never to return, said Paul Chodas, director of NASA’s Center for Near Earth Object Studies.

    It’s the third known interstellar object to cut through our solar system. Interstellar comets like 3I/Atlas originate in star systems elsewhere in the Milky Way, while home-grown comets like Halley’s hail from the icy fringes of our solar system.

    A telescope in Hawaii discovered the first confirmed interstellar visitor in 2017. Two years later, an interstellar comet was spotted by a Crimean amateur astronomer. NASA’s sky-surveying Atlas telescope in Chile spotted comet 3I/Atlas in July while prowling for potentially dangerous asteroids.

    Scientists believe the latest interloping comet, also harmless, may have originated in a star system much older than ours, making it a tantalizing target.

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  • NASA loses contact with its Maven spacecraft orbiting Mars for the past decade

    This combination of ultraviolet spectrum images provided by NASA shows atmospheric features of the planet Mars in July 2022, left, during the southern hemisphere’s summer season, and the planet’s northern hemisphere in January 2023 after Mars had passed the farthest point in its orbit from the Sun, captured by the MAVEN (Mars Atmosphere and Volatile EvolutioN) spacecraft. (NASA/LASP/CU Boulder via AP)

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  • Scientists capture the crackling sounds of what they believe is lightning on Mars

    CAPE CANAVERAL, Fla. — Scientists have detected what they believe to be lightning on Mars by eavesdropping on the whirling wind recorded by NASA’s Perseverance rover.

    The crackling of electrical discharges was captured by a microphone on the rover, a French-led team reported Wednesday.

    The researchers documented 55 instances of what they call “mini lightning” over two Martian years, primarily during dust storms and dust devils. Almost all occurred on the windiest Martian sols, or days, during dust storms and dust devils.

    Just inches (centimeters) in size, the electrical arcs occurred within 6 feet (2 meters) of the microphone perched atop the rover’s tall mast, part of a system for examining Martian rocks via camera and lasers. Sparks from the electrical discharges — akin to static electricity here on Earth — are clearly audible amid the noisy wind gusts and dust particles smacking the microphone.

    Scientists have been looking for electrical activity and lightning at Mars for half a century, said the study’s lead author Baptiste Chide, of the Institute for Research in Astrophysics and Planetology in Toulouse.

    “It opens a completely new field of investigation for Mars science,” Chide said, citing the possible chemical effects from electrical discharges. “It’s like finding a missing piece of the puzzle.”

    The evidence is strong and persuasive, but it’s based on a single instrument that was meant to record the rover zapping rocks with lasers, not lightning blasts, said Cardiff University’s Daniel Mitchard, who was not involved in the study. What’s more, he noted in an article accompanying the study in the journal Nature, the electrical discharges were heard — not seen.

    “It really is a chance discovery to hear something else going on nearby, and everything points to this being Martian lightning,” Mitchard said in an email. But until new instruments are sent to verify the findings, “I think there will still be a debate from some scientists as to whether this really was lightning.”

    Lightning has already been confirmed on Jupiter and Saturn, and Mars has long been suspected of having it too.

    To find it, Chide and his team analyzed 28 hours of Perseverance recordings, documenting episodes of “mini lightning” based on acoustic and electric signals.

    Electrical discharges generated by the fast-moving dust devils lasted just a few seconds, while those spawned by dust storms lingered as long as 30 minutes.

    “It’s like a thunderstorm on Earth, but barely visible with a naked eye and with plenty of faint zaps,” Chide said in an email. He noted that the thin, carbon dioxide-rich Martian atmosphere absorbs much of the sound, making some of the zaps barely perceptible.

    Mars’ atmosphere is more prone than Earth’s to electrical discharging and sparking through contact among grains of dust and sand, according to Chide.

    “The current evidence suggests it is extremely unlikely that the first person to walk on Mars could, as they plant a flag on the surface, be struck down by a bolt of lightning,” Mitchard wrote in Nature. But the “small and frequent static-like discharges could prove problematic for sensitive equipment.”

    These aren’t the first Mars sounds transmitted by Perseverance. Earthlings have listened in to the rover’s wheels crunching over the Martian surface and the whirring blades of its no-longer-flying helicopter sidekick, Ingenuity.

    Perseverance has been scouring a dry river delta at Mars since 2021, collecting samples of rock for possible signs of ancient microscopic life. NASA plans to return these core samples to Earth for laboratory analysis, but the delivery is on indefinite hold as the space agency pursues cheaper options.

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  • China launches Shenzhou 22 spacecraft to assist in return of 3 astronauts

    BEIJING — China launched the Shenzhou 22 spacecraft on Tuesday to help bring back a team of astronauts after a damaged spacecraft left them temporarily stranded on China’s space station.

    The Shenzhou 22 will be used sometime in 2026 by the three astronauts who docked on the Tiangong space station on Nov. 1.

    Earlier this month, another group of Chinese astronauts from the Shenzhou 20 mission faced a nine-day delay in their return to Earth after their craft’s window was damaged. They eventually returned using the Shenzhou 21 spacecraft, which had just carried the replacement crew to Tiangong.

    While the three-person crew landed safely on Earth, three of their fellow astronauts on the replacement crew were temporarily left without a guaranteed way to return in case of an emergency.

    The Shenzhou 20 spacecraft — the damaged one, which for now remains in space — will be brought down to Earth later and assessed, according to state broadcaster CCTV. The space program determined it didn’t meet safety standards for transporting the astronauts.

    Chinese astronauts have been carrying out missions to the Tiangong space station in recent years as part of Beijing’s rapidly progressing space program, initially building out the station module-by-module.

    China developed Tiangong after the country was excluded from the International Space Station over U.S. national security concerns, since China’s space program is controlled by its military.

    Tiangong, which means “Heavenly Palace,” hosted its first crew in 2021. It is smaller than the International Space Station, which has been operating for 25 years.

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  • NASA unveils close-up pictures of the comet popping by from another star

    CAPE CANAVERAL, Fla. — NASA unveiled close-up pictures on Wednesday of the interstellar comet that’s making a quick one-and-done tour of the solar system.

    Discovered over the summer, the comet known as 3I/Atlas is only the third confirmed object to visit our corner of the cosmos from another star. It zipped harmlessly past Mars last month.

    Three NASA spacecraft on and near the red planet zoomed in on the comet as it passed just 18 million miles (29 million kilometers) away, revealing a fuzzy white blob. The European Space Agency’s two satellites around Mars also made observations.

    Other NASA spacecraft will remain on the lookout in the weeks ahead, including the Webb Space Telescope. At the same time, astronomers are aiming their ground telescopes at the approaching comet, which is about 190 million miles (307 million kilometers) from Earth. The Virtual Telescope Project’s Gianluca Masi zoomed in Wednesday from Italy.

    The comet is visible from Earth in the predawn sky by using binoculars or a telescope.

    “Everyone that is in control of a telescope wants to look at it because it’s a fascinating and rare opportunity,” said NASA’s acting astrophysics director, Shawn Domagal-Goldman.

    The closest the comet will come to Earth is 167 million miles (269 million kilometers) in mid-December. Then it will hightail it back into interstellar space, never to return.

    ESA’s Juice spacecraft, bound for Jupiter, has been training its cameras and scientific instruments on the comet all month, particularly after it made its closest pass to the sun. But scientists won’t get any of these observations back until February because Juice’s main antenna is serving as a heat shield while it’s near the sun, limiting the flow of data.

    Named for the telescope in Chile that first spotted it, the comet is believed to be anywhere from 1,444 feet (440 meters) across to 3.5 miles (5.6 kilometers) across. Observations indicate that the exceptionally fast-moving comet may have originated in a star system older than our own — “which gives me goose bumps to think about,” said NASA scientist Tom Statler.

    “That means that 3I/Atlas is not just a window into another solar system, it’s a window into the deep past and so deep in the past that it predates even the formation of our Earth and our sun,” Statler told reporters.

    NASA officials were quick to dispel rumors that this friendly solar system visitor, as they called it, might be an alien ship of some sort. They said that because of the federal government shutdown, they weren’t able to respond to all the theories cropping up in recent weeks.

    The space agency is always on the hunt for life beyond Earth, “but 3I/Atlas is a comet,” said NASA’s associate administrator, Amit Kshatriya.

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  • Blue Origin launches huge rocket carrying twin NASA spacecraft to Mars

    CAPE CANAVERAL, Fla. — Blue Origin launched its huge New Glenn rocket Thursday with a pair of NASA spacecraft destined for Mars.

    It was only the second flight of the rocket that Jeff Bezos’ company and NASA are counting on to get people and supplies to the moon — and it was a complete success.

    The 321-foot (98-meter) New Glenn blasted into the afternoon sky from Cape Canaveral Space Force Station, sending NASA’s twin Mars orbiters on a drawn-out journey to the red planet. Liftoff was stalled four days by lousy local weather as well as solar storms strong enough to paint the skies with auroras as far south as Florida.

    In a remarkable first, Blue Origin recovered the booster following its separation from the upper stage and the Mars orbiters, an essential step to recycle and slash costs similar to SpaceX. Company employees cheered wildly as the booster landed upright on a barge 375 miles (600 kilometers) offshore. An ecstatic Bezos watched the action from Launch Control.

    “Next stop, moon!” employees chanted following the booster’s bull’s-eye landing. Twenty minutes later, the rocket’s upper stage deployed the two Mars orbiters in space, the mission’s main objective. Congratulations poured in from NASA officials as well as SpaceX’s Elon Musk, whose booster landings are now routine.

    New Glenn’s inaugural test flight in January delivered a prototype satellite to orbit, but failed to land the booster on its floating platform in the Atlantic.

    The identical Mars orbiters, named Escapade, will spend a year hanging out near Earth, stationing themselves 1 million miles (1.5 million kilometers) away. Once Earth and Mars are properly aligned next fall, the duo will get a gravity assist from Earth to head to the red planet, arriving in 2027.

    Once around Mars, the spacecraft will map the planet’s upper atmosphere and scattered magnetic fields, studying how these realms interact with the solar wind. The observations should shed light on the processes behind the escaping Martian atmosphere, helping to explain how the planet went from wet and warm to dry and dusty. Scientists will also learn how best to protect astronauts against Mars’ harsh radiation environment.

    “We really, really want to understand the interaction of the solar wind with Mars better than we do now,” Escapade’s lead scientist, Rob Lillis of the University of California, Berkeley, said ahead of the launch. “Escapade is going to bring an unprecedented stereo viewpoint because we’re going to have two spacecraft at the same time.”

    It’s a relatively low-budget mission, coming in under $80 million, that’s managed and operated by UC Berkeley. NASA saved money by signing up for one of New Glenn’s early flights. The Mars orbiters should have blasted off last fall, but NASA passed up that ideal launch window — Earth and Mars line up for a quick transit just every two years — because of feared delays with Blue Origin’s brand-new rocket.

    Named after John Glenn, the first American to orbit the world, New Glenn is five times bigger than the New Shepard rockets sending wealthy clients to the edge of space from West Texas. Blue Origin plans to launch a prototype Blue Moon lunar lander on a demo mission in the coming months aboard New Glenn.

    Created in 2000 by Bezos, Amazon’s founder, Blue Origin already holds a NASA contract for the third moon landing by astronauts under the Artemis program. Musk’s SpaceX beat out Blue Origin for the first and second crew landings, using Starships, nearly 100 feet (30 meters) taller than Bezos’ New Glenn.

    But last month NASA Acting Administrator Sean Duffy reopened the contract for the first crewed moon landing, citing concern over the pace of Starship’s progress in flight tests from Texas. Blue Origin as well as SpaceX have presented accelerated landing plans.

    NASA is on track to send astronauts around the moon early next year using its own Space Launch System, or SLS, rocket. The next Artemis crew would attempt to land; the space agency is pressing to get astronauts back on the lunar surface by decade’s end in order to beat China.

    Twelve astronauts walked on the moon more than a half-century ago during NASA’s Apollo program.

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  • China’s stranded astronauts ‘in good condition’ after space debris delays planned return

    BEIJING (AP) — The stranded crew of a Chinese space mission is “in good condition, working and living normally,” China’s Manned Space Engineering office said on Tuesday.

    The three astronauts on the Shenzhou-20 mission are facing a delayed return to Earth after their scheduled Nov. 5 return was aborted after their spacecraft was believed to have been struck by a small piece of space debris.

    The return has been pushed back to an unspecified date, but the mission team is carrying out tests and drills, according to a statement issued by the space agency.

    “The Shenzhou-20 crew is in good condition, working and living normally,” the statement said.

    The three astronauts — Chen Dong, Chen Zhongrui and Wang Jie — traveld to the Tiangong space station in April and were finishing their six-month rotation.

    The replacement Shenzhou-21 mission successfully docked with the space station on Nov. 1, carrying for the first time a group of mice for experiments.

    China has made steady progress with its space program since 2003. It has built its own space station and has a goal of landing a person on the moon by 2030.

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  • Stranded astronauts ‘in good condition’ after space debris delays planned return

    FILE – Chinese astronaut for the Shenzhou 20 mission, Chen Dong, center, speaks next to his comrades Chen Zhongrui, right, and Wang Jie as they attend a send-off ceremony for their manned space mission at the Jiuquan Satellite Launch Center in northwestern China, Thursday, April 24, 2025. (AP Photo/Andy Wong, file)

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  • How to spot November’s supermoon, the closest of the year

    NEW YORK — The moon will look slightly bigger and brighter Wednesday night during the closest supermoon of the year.

    The moon’s orbit around the Earth isn’t a perfect circle, so it gets nearer and farther as it swings around. A so-called supermoon happens when a full moon is closer to Earth in its orbit. That makes the moon look up to 14% bigger and 30% brighter than the faintest moon of the year, according to NASA.

    November’s supermoon is the second of three supermoons this year and also the closest: The moon will come within just under 222,000 miles (357,000 kilometers) of Earth.

    Tides may be slightly higher during a supermoon because the moon is closer to Earth, said astronomer Lawrence Wasserman with Lowell Observatory. But the difference isn’t very noticeable.

    No special equipment is needed to view the supermoon if clear skies permit. But the change in the moon’s size can be tough to discern with the naked eye.

    “The difference is most obvious as a comparison between other images or observations,” said Shannon Schmoll, director of Abrams Planetarium at Michigan State University, in an email.

    Supermoons happen a few times a year. One in October made the moon look somewhat larger, and another in December will be the last of the year.

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  • Dinosaurs thriving in North America before mass-extinction asteroid strike: Study

    Scientists have long debated whether dinosaurs were in decline before an asteroid smacked the Earth 66 million years ago, causing mass extinction.

    New research suggests dinosaur populations were still thriving in North America before the asteroid strike, but it’s only one piece of the global picture, independent experts say.

    “Dinosaurs were quite diverse and now we know there were quite distinct communities” roaming around before being abruptly wiped out, said Daniel Peppe, a study co-author and paleontologist at Baylor University.

    The latest evidence comes from analyzing a portion of the Kirtland Formation in northern New Mexico that’s been known for around 100 years to contain several interesting dinosaur fossils.

    Scientists now say those fossils and the surrounding rocks date from around 400,000 years before the asteroid struck, which is considered a short interval in geologic time. The age was determined by analyzing small particles of volcanic glass within sandstone and by studying the direction of magnetic minerals within mudstone of the rock formation.

    The results show “the animals deposited here must have been living close to the end of the Cretaceous,” the last dinosaur era, said Peppe.

    The findings were published Thursday in the journal Science.

    Differences between the dinosaur species found in New Mexico and those found at a site in Montana that were previously dated to the same time frame “run counter to the idea that dinosaurs were in decline,” he said.

    The fossils previously found at the New Mexico site include Tyrannosaurus rex, a huge, long-necked dinosaur, and a Triceratops-like horned herbivore.

    Scientists who weren’t involved in the study cautioned that evidence found at a single location might not point to a broader trend.

    “This new evidence about these very late-surviving dinosaurs in New Mexico is very exciting,” said University of Bristol paleontologist Mike Benton, who was not involved in the study. But he added, “This is just one location, not a representation of the complexity of dinosaur faunas at the time all over North America or all over the world.”

    Although scientists have found dinosaur fossils on every continent, accurately dating them can be a challenge, said paleontologist and study co-author Andrew Flynn of New Mexico State University. Easily datable material such as carbon doesn’t survive in fossils, so scientists must look for surrounding rocks with precise characteristics that can be used to determine ages.

    Further research might help complete the picture of what range of dinosaur species was alive globally on the eve of the asteroid crash, said Flynn.

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  • Two green comets shine bright. How to spot them in the night sky

    NEW YORK (AP) — Two bright green comets are streaming through the skies and are visible to skygazers in the Northern Hemisphere.

    Both hail from the outer edges of our solar system — possibly what’s known as the Oort Cloud, well beyond Pluto. Comet Lemmon will have its closest brush with Earth on or around Tuesday. The other cosmic snowball, Comet SWAN, should have its flyby with Earth on Monday, but it’s headed away from the sun and will likely grow dimmer as the days pass.

    Spotting two comets simultaneously without special equipment is “rare, but not unprecedented,” said Carson Fuls, director of the University of Arizona-based sky survey that spotted Comet Lemmon.

    To see the pair, go outside just after sunset and look to the northern sky for Comet Lemmon close to the horizon. Comet SWAN will also be near the horizon, but to the southwest.

    The double comets could be visible with binoculars through the end of the month, but experts aren’t yet sure how bright they’ll remain, said astronomer Valerie Rapson of the State University of New York at Oneonta.

    Comets are frozen leftovers from the solar system’s formation billions of years ago. They heat up as they swing toward the sun, releasing their characteristic streaming tails.

    Comet Lemmon, also designated C/2025 A6, was discovered in January by a telescope scouring the night sky for near-Earth asteroids. Comet SWAN, also known as C/2025 R2, was spotted in September by an amateur astronomer using photos from a spacecraft operated by NASA and the European Space Agency.

    The comets are green because of gases streaming off their surfaces. From Earth, they’ll look like gray, fuzzy patches.

    Earlier this year, a green comet broke up as it swung by the sun, dashing hopes of a naked-eye spectacle. A bright comet called Tsuchinshan-Atlas zoomed by Earth in 2024, and other notable flybys included Neowise in 2020 and Hale-Bopp and Hyakutake in the 1990s.

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