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An artist's impression of a gamma-ray burst, a powerful jet of energy lasting from less than a second to several minutes. The most powerful events in the universe, they are thought to be mostly associated with the explosion of stars that collapse into black holes. A. Roquette/ESO hide caption

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A. Roquette/ESO

Venus on the eastern limb of the Sun captured by TRACE satellite. NASA hide caption

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The Venus Transit: Who Cares?

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The surface of Mercury is seen in a picture taken by NASA's Messenger spacecraft as it approached the planet during a fly-by on January 14, 2008. The image was taken about 11,000 miles from the planet and shows a region 300 miles across. NASA/Getty Images hide caption

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NASA/Getty Images