Episode 2: The alien underground. Half a mile below the surface of the earth, in a cave too hot to explore without an ice-packed suit, NASA scientist and Nat Geo explorer Penny Boston clambers ...

Discover showtimes, read reviews, watch trailers, find streaming options, and see where to watch Alien (1979). Explore cast details and learn more on Moviefone.

Beyond our solar system, countless alien worlds of lava, ice, water and noxious gas swirl through the cosmos. Here are some ...

Life probably exists beyond Earth. So how do we find it? With next-generation telescopes, tiny space probes, and more, scientists aim to search for life beyond our solar system—and make contact.