The third known visitor from another star system, Comet 3I/ATLAS, has been racing through the Solar System with just enough weirdness to ignite a familiar debate: is it natural or could it be ...
By the time the rumours reached the 'alien probe' stage, 3I/ATLAS had already slipped past the Sun and was heading back into the dark, doing what comets do best: ignoring human drama. Yet a faint, ...