If and when SETI discovers alien life, a revised Declaration of Principles guarantees once the discovery has been verified, ...

To travel between solar systems, a spacecraft would need extremely sophisticated – if not impossible – technology.

Science fiction stories about “alien” invaders are often political allegories for anxieties around immigration. Now, a ...

For over six decades, the Search for Extraterrestrial Intelligence (SETI) has been tirelessly scanning the cosmos for signs of alien life. Despite its extensive efforts, the universe remains eerily ...

Bring up aliens and a lot of people will scoff. But not everyone is laughing. Around the turn of the century, 3.8 million people banded together in a real-time search for aliens — with screensavers.

One day, probably far off in the very distant future, if astronomers are correct in their assumptions about the vastness of space, Earth will be visited by intelligent beings from another planet.

Disclosure Day director Steven Spielberg says he believes aliens from outer space have "absolutely" been on Earth and are ...