Giant, mysterious rippling wave detected in Milky Way by Gaia Telescope

For decades, astronomers have known that stars orbit the Milky Way’s centre and that the galactic disc is warped.

This rare green comet won’t return for a thousand years. Here’s how to see it this week.

Comet C/2025 A6 (Lemmon) is this year’s brightest comet visible from Earth—an icy relic from the solar system’s origins that ...