Are humans alone in the universe, or could intelligent alien civilizations exist somewhere beyond Earth? For more than 60 ...

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.

The physicist explained what he finds so terrifying about the prospect of us being alone in the universe ...

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 ...