It's a question that's been debated and debunked for decades: Are aliens real? The word "alien" can create mental images of different creatures in people's heads thanks to Hollywood − gentle and ...

A nuclear engineer analyzes the Kurzgesagt episode about why aliens might already be traveling toward Earth and breaks down the science behind interstellar travel and cosmic timelines. The video ...

Landmark UFO documents smuggled out of Russia 30 years ago — and just publicly revealed — show the Soviets investigated thousands of reports of extraterrestrial craft and encounters with aliens.