Comet 3I/ATLAS has arrived in the inner solar system behaving as if the usual rules of comet physics were optional. Instead of trailing a neat plume of dust away from the Sun, it has grown a striking ...

Astronomers have spotted a first-of-its-kind rapidly crumbling planet outside the Solar System that is leaving behind a “gargantuan” comet-like tail of debris. The Mercury-sized planet, dubbed BD+05 ...