COLUMBUS, Ohio — In a cosmic first for this decade, astronomers have identified a mysterious comet from another galaxy — ...

Officially named 3I/ATLAS, the comet was confirmed as having originated outside of Earth's solar system on July 3, according ...

Comet C/2023 A3 (Tsuchinshan-ATLAS) sports prominent dust and ion trails in this photo taken on the morning of Sept. 30. The imager used a 12-inch scope and LRGB exposures of 200, 100, 100, and ...

NASA has discovered an interstellar comet that's wandered into our backyard. Luckily, it won't get near enough to be a threat ...

Space scientists say they are preparing a comet interceptor spaceship as the third interstellar object ever detected was ...