Astronomers are closely tracking a mysterious interstellar comet showing an unusual wobble and unexpected flaring activity.

The past year won't be remembered as one that marked a record of important space missions, but one when the foundations for ...

Last Friday, the interstellar comet designated 3I/ATLAS completed its closest approach to Earth without crashing into us or depositing an invading armada.

Pluribus imagines Kepler-22b as an ocean world that sends a gift to humanity through radio waves. In real life, no such ...

From mudstones on Mars to strange gases in exoplanet atmospheres, tentative evidence for extraterrestrial life is starting to ...

Astronomers thought they had seen the "first hints of life on an alien world" this year, but they disappeared under closer ...

Avi Loeb says interstellar objects such as 3I/ATLAS could carry time capsules into deep space faster than spacecraft built with 1970s technology ...

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Scientists have sought out and detected radio emissions from from interstellar comet 3I/ATLAS, all but confirming that it has natural origins.

I/ATLAS comet is the 3rd-ever object discovered that originated from outside our solar system. It's not a threat, approaches ...

3I/ATLAS came within 168 million miles of Earth around midnight CST Friday. While that might seem pretty far away, the ...

On Friday, interstellar comet 3I/ATLAS makes its nearest approach to Earth. Here's what you need to know, and how to track ...