Elon Musk has turned a long-running joke about being an extraterrestrial into a central part of his public persona, even as he argues that humanity may be the only intelligent life in the universe.

NASA officials have previously spoken of the possibility of extraterrestrial life amid scientific uncertainty while ...

Astronomers raised hopes that humanity might not be alone in the universe by announcing on Thursday they have detected the most promising hints yet of life on a distant planet. But given the age and ...

Movies like "Disclosure Day" and "Project Hail Mary" renew our fascination with extraterrestrials and the idea that humankind ...