The giant planets weren't always where we find them today. Jupiter, Saturn, Uranus and Neptune formed in a more compact ...

Interstellar comet 3I/ATLAS makes its closest approach to Earth on Dec. 19. Here's how you can track its progress both during ...

The comet—only the third known interstellar visitor to our solar system—will make its closest approach of the Earth this week ...

Scientists using NASA's James Webb Space Telescope have observed a rare type of exoplanet, or planet outside our solar system ...

Comet 3I/ATLAS will get closest to Earth on Dec. 19, and astronomers will be watching.

This interstellar vagabond is only the third large interstellar visitor that we have ever discovered — an asteroid or comet ...

A mysterious object that a controversial scientist claims could be an alien battleship reaches its closest point to Earth on ...

For years, astronomers have tracked unexplained movements in distant objects beyond Neptune. The theory? A massive ninth planet, hiding in the darkness. Despite years of searching, no one has seen it ...

Scientists have been cataloging comet 3I/ATLAS’s journey through the Solar System since July, tracking major milestones as ...

David Rankin of the Catalina Sky Survey in Arizona spends nights scanning the solar system for potentially catastrophic space ...