Even at this early stage in our spacefaring age, humanity has already begun sending probes that will eventually reach other solar systems, even if that was not their original intention. Five robotic ...

Strange interstellar comet speculated to be alien spacecraft is older than Solar System - Scientists say comet represents preserved fragment of ancient planetary system ...

Alien probes could already be hiding somewhere in our Solar System – and our current surveys are nowhere near good enough to rule them out, according to a NASA‑linked study presented this month by ...

A mysterious cigar-shaped object spotted tumbling through our solar system last year may have been an alien spacecraft sent to investigate Earth, astronomers from Harvard University have suggested.