Observers track an unknown airframe during Air Force trials at Area 51 ...

A siphonophore—a colonial marine invertebrate related to the venomous stinging Portuguese Man-o-war—is scanned using Deep ...

The universe seems endlessly vast and secretive when gazing up at a clear desert sky. Some researchers are concerned about who might be staring back a ...

A Harvard University cosmologist who has suggested alien life forms could be sailing into the solar system disguised as meteors is leading the Trump administration’s secretive new scientific advisory ...