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

The group leading the charge in the search for extraterrestrial life has given the all clear: An interstellar comet looks to be completely natural and free of any alien tech. The SETI Institute said ...

Five years ago a very strange object—maybe a thousand feet long, oblong, shiny and fast—streaked across space, tens of millions of miles from Earth. Its course and speed indicated it had come from ...

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.