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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NASA

The Venus Transit: Who Cares?

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A composite of Lyrids over Huntsville, Ala., in 2009. This year, the meteor shower will hit its peak before dawn Sunday morning. Danielle Moser/MSFC/NASA hide caption

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Danielle Moser/MSFC/NASA

Lights Off, Eyes Open: New Moon Darkens Skies For Meteor Shower

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