NASA spacecraft reaches asteroid Bennu, plans to send 4 pounds of rock back to Earth

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An interplanetary visitor has arrived at asteroid Bennu.

On Monday, NASA’s OSIRIS-REx spacecraft reached the relatively small asteroid after an over two-year journey through the solar system. The 1,600-foot diameter space rock, about the height of the Empire State Building, is of great interest to scientists as the lump of rubble and organic materials might provide a future fuel depot for deep space missions, and likely holds ancient clues about our solar system’s formation. 

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