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The Mountains of Mars (2:27)
Scientists determine the mountains on Mars did not form by plate tectonics.
Tank on the Moon: Taking Flight (1:49)
The U.S. accomplishes its mission of having men walk on the moon and the Soviet Union is left waiting in the wings. Learn more about NASA and the space race in this video.
The Planets: The Sun and Solar Wind (1:54)
The sun generates powerful, electrically-charged storms that lash out across the inner planets.
Destiny - The Sun's Fate (1:48)
Like other stars of its type, our Sun will eventually become a planet-engulfing red giant.
The Planets: Terra Firma - Mars (3:39)
The 1976 Viking Lander touches down on the "red planet" and sends back the first close-up images of the surface. Learn more about the exploration of Mars in this video.
