A striking optical illusion resembling a floating city or alien spacecraft was captured on camera above the countryside in ...

Even at this early stage in our spacefaring age, humanity has already begun sending probes that will eventually reach other ...

Strange interstellar comet speculated to be alien spacecraft is older than Solar System - Scientists say comet represents ...

A NASA‑linked study argues that alien probes could already be in our Solar System, but our surveys are still too crude to ...