Sagan's team created the greatest puzzle of all time, which you can only solve if your species understands the basic nature ...

For decades, humanity has listened to the cosmos, hoping that somewhere among the stars another civilization might be trying ...

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 ...

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.

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

The nature of space, time and the evolution of life on Earth mean it’s unlikely extraterrestrial life has visited our home planet.

Harvard astrophysicist Avi Loeb has floated the provocative idea that humans might themselves be alien‑made 'autonomous probes,' built through advanced synthetic biology rather than evolving entirely ...

Scientists detected something unusual entering our Solar System two months ago, leading to speculation about whether it was a ...

Director Steven Spielberg claimed aliens have already visited planet Earth – and now scientists said he may be on the money, ...