ufos

UFO sightings during NATO war games in 1952 set the stage for the season finale of "Project Blue Book," the History channel's series about the U.S.' real-life UFO-hunting program.

Read an excerpt from the new book "They Are Already Here: UFO Culture and Why We See Saucers" by Sarah Scoles.

Space.com sat down with Sarah Scoles, author of "They Are Already Here: UFO Culture and Why We See Saucers."

"Project Blue Book," the hit television docudrama about the U.S. military's investigations into aliens more than 50 years ago, is back for Season 2.

The great distances covered by visiting "aliens" may be ones of time rather than space, a recent book argues.

A private company that researches UFOs has a new contract with the U.S. government.

Chilean officials are investigating a curious collection of burning objects that fell onto parts of the country last week.

Presidential candidate Bernie Sanders (D-VT) says he's prepared to disclose government information about UFOs if he wins in 2020.

The former leader of the U.S. government's top-secret UFO program has stories to tell, and he is sharing some of them for the first time in a new documentary.