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

NASA's Fermi Gamma-ray Space Telescope spotted an unusually long gamma-ray burst (GRB) on July 2, 2025. It was unlike anything ever since, even though GRBs are quite common. This one lasted seven ...

An “extra exceptional” Tatooine-like exoplanet, orbiting two suns, has been discovered. Astronomers say the “huge” new world ...