Interstellar comet 3I/ATLAS is leaving our solar system, but the latest observations have raised new questions about its ...

April is the gift that keeps on giving for astronomy aficionados. Along with sightings of the northern lights, be sure to look up for another dazzling surprise: an ancient comet. Comet C/2025 R3, also ...

Add Yahoo as a preferred source to see more of our stories on Google. An interstellar comet that blazed past the sun and swung by Earth last year could be nearly three times older than our solar ...

Gas leaving the interstellar comet 3I/ATLAS moves at roughly half the speed of gas coming off Solar System comets at the same ...

Learn how you can say farewell to comet 3I/ATLAS as it passes by Earth on Dec. 19, 2025, and what we have learned during its brief visit near Earth. Everyone’s favorite comet is about to fly away from ...

Comets formed in the cold, outer part of the solar system, yet they carry tiny grains of rock that were once melted. For years, scientists read those grains as visitors that had drifted out from ...

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The comet is the third object ever confirmed to have entered our cosmic neighborhood from elsewhere in the galaxy. Space telescopes and orbiters have been documenting the rare visit. A mysterious ...

Learn how ALMA observations revealed unusually high levels of methanol in interstellar comet 3I/ATLAS and what the molecule’s chemistry may reveal about how icy bodies form around other stars. Comet ...

The interstellar comet 3I/ATLAS was the third object ever discovered in our solar system that originated from another star system. Despite a viral conspiracy theory, NASA officials have repeatedly ...

Astronomers have revealed new details about the make-up and age of a visiting comet that was born around a distant star. They conclude that the composition of 3I/Atlas is strikingly different from any ...