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The Andromeda galaxy is heading straight toward our own Milky Way.

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Dr. Natalie Batalha, a Kepler Mission scientist, is using technology that is out of this world—and out of this solar system—to locate exoplanets, some of which could be Earth-like planets that may be hosts to extraterrestrial life.

Episode of the PBS series NOVA from 1987. "This is a case study of the Galileo Project, scheduled to be launched in Spring, 1986, but cancelled after the Challenger tragedy. A behind-the-scenes look at the space mission which was to have explored Jupiter, the largest planet.