Until the U.S. government has data or samples of alien material that can be shared, the story of extraterrestrial visitors is ...

There are all sorts of things flying around the universe that we earthlings haven't yet figured out how to identify.

Forty years ago, on January 28, 1986, the nation gathered to watch the Space Shuttle Challenger launch, a historic mission carrying the first "teacher in space," Christa McAuliffe. But 73 seconds into ...