Today is one astronomers, stargazers and alien conspiracy theorists have been waiting for: interstellar comet 3I/ATLAS is as ...

Interstellar Comet 3I/ATLAS makes its closest Earth pass early on Dec. 19. Here's what astronomers know about its origin and ...

A comet from another star system is sweeping through our cosmic backyard and, for the first time, astronomers have picked up ...

The interstellar comet 3I/ATLAS is just days away from coming as close to Earth as it will ever get. Here's how you can track ...

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

3I/ATLAS has now made its closest approach to the sun and Earth and is now heading back out toward the outer solar system. On ...

Interstellar comet 3I/ATLAS made its closest approach to Earth early on Friday, Dec. 19. While it didn't come close enough to ...

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

The controversial Harvard astronomer is one of the main sources of the "alien mothership" hypothesis. This is what he thinks, ...

On Dec. 19, 3I/ATLAS will be about 1.8 astronomical units away (170 million miles), almost twice as far as the average ...

Interstellar comet 3I/ATLAS will fly by our planet at a safe distance of 1.8 astronomical units (roughly 167 million miles or ...

It's only the third object in history from outside our solar system to be discovered cruising through our area of space.