The "alien mothership" hypothesis for interstellar comet 3I/ATLAS is about to have a key test, as it hits solar conjunction and perihelion. What does that mean, and why is a Harvard professor of ...

Astronomers are preparing for a decisive test as interstellar object 3I/ATLAS reaches its perihelion on 29 October 2025, when it will pass behind the Sun. The comet—formally designated C/2025 P1 ...

A recent conundrum about a star 1,500 light years away discovered by the Kepler Space Telescope has extraterrestrial enthusiasts crying "alien" as an explanation, but scientists studying the star are ...