This video breaks down why K2-18b has suddenly become one of the most important planets in the search for life beyond Earth.

Only 6.6% of surveyed astrobiologists agreed that scientists had probably found extraterrestrial life on exoplanet K2-18b.

A former CIA-funded researcher claimed that "at least four" different alien species have been discovered in wreckage collected by the U.S. government, though no physical evidence has been submitted to ...

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

Obama emphasized there’s no way such a secret could stay confidential. “If there were aliens or alien spaceships or anything under the ...

The Pentagon's release of files might help scientists shed light on unexplained phenomena and government secrets, experts said.