A former CIA-linked physicist's comments about 'four alien species' have reignited UFO conspiracy theories online.

A NASA astronaut preparing for a grueling eight-month stint in orbit reveals a plan to test for extraterrestrial life.

Internet-famous UFO stories so wild they may just be true Alien and UFO sightings have been anomalies for decades. While the existence of extraterrestrials has become a laughingstock, with SNL making ...

UFOs have long been a central theme in popular culture. TV shows and films from "Mork and Mindy" to the "X-Files," from "E.T." to "Men In Black," and music bands from the Carpenters to Radiohead, have ...

The Pentagon has released another batch of ‘UFO Files’ with footage of unknown objects in the sky—here are the most common ...

Astrophysicist challenges UAP claims, urges government to show proof of alien life. Miriam Espacio/Unsplash Astrophysicist and ...

The International Academy of Astronautics has updated its protocols for confirming and announcing the discovery of alien life.

It's World UFO Day, but questions about aliens, UFOs and what governments know about them remain. UFO researcher Jon Stewart ...

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Thousands of people have reported UFOs or alien encounters in Northern California. That number could soon go up.