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Our Solar System: The Size of the Sun
- The size of the sun is a balance between the outward pressure made by the release of energy from nuclear fusion and the inward pull of gravity.
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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.
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Shape of the Universe
(2:34)
Learn about the forms and contours of the universe.
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Shooting Stars: Meteors and Meteorites
(1:31)
Shooting stars come in the wake of comets and are commonly known as meteors.
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The End of the Era of Stars
(3:04)
Some experts believe the galaxy will eventually be devoured by black holes.
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Does Earth have a Twin?
(0:51)
Watch this Reuters video showing a computer mock-up of the smallest planet ever found outside our solar system, and it could be very similar to Earth. The new planet is circling a small red dwarf star 30 light years away in the constellation of Leo.
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Could a Black Hole Destroy the Earth?
(2:08)
Some black holes move from place to place, and one could destroy earth. Learn more about black holes in this HowStuffWorks video.
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Humans Already on Mars
(0:37)
Have humans already landed on Mars? Watch this Reuters video of new pictures taken by NASA's Spirit Rover that shows an image resembling a human shape on Mars. NASA is planning more investigation.
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What Are the Odds? Aliens
(2:48)
What are the odds that extraterrestrial life exists? Learn more about life on other planets in this video.
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