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Comets Lemmon and SWAN reach their brightest this weekComet Lemmon (C/2025 A6) makes its closest approach to Earth on Oct. 21, about 24 hours after the fainter Comet SWAN (C/2025 R2) does the same. Here's how, where and when to see them both.
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Comet 3I/ATLAS is losing water 'like a fire hose' on full blastResearchers have discovered that interstellar comet 3I/ATLAS has been shedding water, providing insights into the building blocks of life outside of our solar system and the evolution of interstellar comets.
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'Closest view' yet of interstellar comet 3I/ATLAS captured by Mars orbiterThe European Space Agency's ExoMars orbiter has captured the closest view yet of the interstellar comet 3I/ATLAS. The images reveal the comet's bright coma but show no signs of a tail.
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Interstellar comet 3I/ATLAS may come from the mysterious frontier of the early Milky Way, new study hints
The interstellar comet 3I/ATLAS does not come from our corner of the Milky Way, and may be a time capsule of the early galaxy, new research into its trajectory hints.
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Newly discovered comet 'Lemmon' may be visible to the naked eye this month — but it will look more like a limeComet Lemmon, discovered earlier this year, will make a close approach to Earth later this month, giving skywatchers the chance to see its surprising lime-green glow.
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Skywatching alert! See 2 bright comets on the same night as a meteor shower this OctoberComet C/2025 R2 (SWAN) can now be seen with binoculars close to Mars in the western sky after sunset.
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Interstellar comet 3I/ATLAS could be turning bright green, surprising new photos revealNew photos captured during the recent "blood moon" total lunar eclipse show that the interstellar comet 3I/ATLAS may be turning green as it gets closer to the sun.
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I watched scientists view the interstellar comet 3I/ATLAS in real time. Here's what they saw.The Gemini South Observatory opened up its telescope to the public as a team of astronomers looked at the interstellar comet 3I/ATLAS in real time.
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New photos of comet 3I/ATLAS reveal its tail growing before our eyes
New images reveal interstellar comet 3I/ATLAS beginning to grow a signature tail as it zooms closer to the sun ahead of a close encounter with Earth this fall.
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