In 2004, Comet C/2001 Q4 (NEAT), seen here, passed within 30 million miles of the Earth's orbit. A new report suggests that such near-Earth objects may go undetected by NASA, unless additional funding is provided. Courtesy of NASA hide caption

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Space Shuttle Discovery lands at Edwards Air Force Base on Sept. 11, 2009. Discovery has been promised to the Smithsonian, but NASA's other two shuttles, Endeavour and Atlantis, are still up for grabs. NASA/David Huskey/WSTF hide caption

toggle caption NASA/David Huskey/WSTF

A view of the central region of the Milky Way galaxy. Dark matter accounts for over 70% of the mass of the Milky Way, but because dark matter is invisible, all we see when we look up in the sky is a small amount of stars, planets and gas. AP/NASA hide caption

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