If ancient alien explorers ever traipsed through Earth's cosmic neighborhood, could it be possible they left behind some interstellar litter on the moon?

Researchers propose that tiny technological remnants from extinct alien civilizations could have landed on the moon after ...

A team of researchers argues that the Moon could have been collecting microscopic fragments of alien technology for billions ...

Most of our experience with the Search for Extraterrestrial Intelligence (SETI) has focused on capturing radio signals that ...

Diggers unearth two giant bones and mysterious metal object that was created before humans even existed. See more in this clip from Season 21, Episode 4, "The Top Ten Unexplained Technologies." ...