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Interstellar comet 3I/ATLAS will reach its closest point to Earth on Friday, 19 December, offering astronomers a narrow but important window to study a rare object passing through the solar system.

For months now, astronomers have been closely watching the mysterious interstellar object 3I/ATLAS as it rips through the solar system at a breakneck velocity. And before it finally leaves us for good ...

The mysterious Manhattan-sized interstellar object 3I/ATLAS appears to have no cometary tail in new images, which would eliminate the conventional explanation for the surprising “non-gravitational ...

The Manhattan-size interstellar object 3I/ATLAS exhibited signs of non-gravitational acceleration and appeared “bluer than the sun” as it passed our local star — which could be signs of an alien craft ...

An interstellar comet that originated outside our solar system just made its closest pass of the sun, setting it on an outgoing path — but it’s not leaving our cosmic neighborhood yet. The comet, ...