Add Yahoo as a preferred source to see more of our stories on Google. Distance, light speed, biology, and time may explain why alien civilizations never meet. (CREDIT: Wikimedia / CC BY-SA 4.0) "There ...

Earth’s deep past leaves plenty of unanswered questions. None currently proves an alien visit, but scientists know the ...

“There is a silence in the night sky that has bothered me for as long as I can remember.” That line, attributed to Richard Feynman, lands because it gets at a simple, stubborn feeling. The sky looks ...

For decades, radio SETI searches have focused on one important question: if another technological civilization is trying to contact us, how would they send that message? For Dr. Zuckerman, the ...

A new study published as a preprint on arXiv suggests that advanced extraterrestrial civilizations might not need to surround stars with giant structures to collect energy. Instead, they could extract ...