Earth already contains organisms that survive conditions humans could never endure. Alien life, if it exists, may force ...

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

The question of whether aliens exist is not a new one. In science fiction films and books, people have wondered if we’re the only life in this universe and what that can imply for universes beyond ...

Robert Smith is convinced the aliens have won. "The invasion has happened—it's all over," says the University of Alberta space historian who teaches a course on the history of extraterrestrials. It's ...