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.

NASA's hunt for alien life may be undermined by its own instruments, according to a group of leading astrobiologists who warn that current tools and mission designs are likely missing subtle, but ...

A paper from a SETI (search for extraterrestrial intelligence) Institute scientist has directly addressed claims that interstellar comet 3I/ATLAS is an alien spacecraft. OnJuly 1, 2025, the Asteroid ...