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Ancient Observatory in Peru
- Watch this video about observatories on HowStuffWorks. They estimate the construction dates back 2,300 years - 800 years before Jesus Christ. Little is known about the people who built the observatory, which consists of thirteen stone towers and is known as the Thirteen Towers of Chankillo.
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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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Space Week: Space Station and Beyond 1
(1:21)
For the privileged few, the view from the International Space Station is ever-changing and always amazing. Learn more about the International Space Station in this video.
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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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Shape of the Universe
(2:34)
Learn about the forms and contours of the universe.
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Space Week: Space Station and Beyond 2
(2:41)
A mission to Mars will be an expensive, long-term endeavor, but it's a dream that inspires the next generation of spacefarers. Learn more about the mission to Mars in this 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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Why Aren't There Green or Purple Stars?
(3:16)
Watch this NASA video explaining why we don't see green or purple stars. The key is in the way light refracts and reflects into our eyes. Video courtesy of the Spitzer Science Center.
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Physics: Primal Forces
(2:53)
Learn about the primal forces of the universe-gravity, electromagnetic, the Strong and Weak nuclear force.
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