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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 Mountains of Mars (2:27)
Scientists determine the mountains on Mars did not form by plate tectonics.
The Moon: Tides (4:00)
Tides are produced by the pull of gravity from the moon. Tide levels may vary by several feet depending on the depth of the water and the surface features. These forces are slowly causing the Earth's rotation to slow.
Destiny - The Sun's Fate (1:48)
Like other stars of its type, our Sun will eventually become a planet-engulfing red giant.
Tank on the Moon: Improving the Lunokhod (2:59)
With the basic design completed, scientists work to improve the Lunokhod for further testing. Learn more about lunar exploration in this video.
