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Stream the full National Geographic - Hunt For Aliens movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

With many scientists increasingly convinced that we are not alone in the universe, take a look at how alien contact might occur. Renowned NASA scientists, planet-hunters and astronomers reveal emerging methods of finding earthlike planets and alien life and look at possible future techniques, including fiber-optic probing and interstellar travel powered by light at warp speeds. Also, get an inside look at the $50 million Allen Telescope Array in northern California designed to hear from extraterrestrials. Could our time alone in the universe be coming to an end?