The US government has been sharing more information about UFOs. That's fueling excitement over the possibility of the president announcing that humans are not alone. Twenty years later, the former is ...

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.

Are we alone in this universe? Is there intelligent life out there? Or are they living among us? Humans have wondered about ...