There are things the NASA chief has "come across in the job that he can’t explain," but aliens are not among them.

Trump last week took to social media to say he’ll ask executive agencies to identify and release files that pertain to alien ...

Are aliens real? The question has animated conspiracy theories for decades and enthralled at least one former president of ...

Science fiction has imagined everything from little green men to tentacled monsters—but real biology may offer clearer clues. Evolution follows universal rules, meaning alien life on Earth-like ...

Bring up aliens and a lot of people will scoff. But not everyone is laughing. Around the turn of the century, 3.8 million ...

A viral Obama podcast answer about aliens prompted Trump to accuse him of revealing secrets and promise to release UFO files ...