A medieval monk may have beaten Edmond Halley to one of astronomy’s greatest discoveries by nearly 700 years. Researchers say ...

Halley’s Comet naming controversy is reshaping astronomy history after new medieval research revealed a forgotten discovery ...

Interstellar comet 3I/ATLAS was almost called 3I/Rubin, after researchers found that the giant survey telescope ...

On May 17, 1882, an eclipse trekked across Africa, the Middle East, and Asia. Many scientists gathered in Egypt to witness it ...

Astronomers found 'heavy water' in interstellar comet 3I/ATLAS, suggesting it formed in a cold, unusual environment beyond ...

A rare comet from another star system is revealing just how different alien solar systems may be from our own.

A mysterious comet from beyond our solar system is giving astronomers a rare glimpse into alien worlds — and it may have ...

The second wave of observations, conducted since December 2025, have allowed scientists to better characterize the chemical ...

Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically different from anything known to have ever formed around our sun ...

Looking for a sky event this week? Check out our full Sky This Week column. May 9: Look the croc in the eye Although still ...

During the past few years, we have witnessed a bumper crop of bright naked-eye comets, beckoning us to set up a camera and record their beauty to share with friends and family. However, the next great ...

The fate of a comet that was predicted to pass close to Earth remains a mystery five years after its dramatic breakup in the inner solar system — but some astronomers think a part of it might still be ...