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March 15, 2011 4:04 PM

Hone your galaxy-hunting skills

When ancient astronomers saw dark spots on the moon, they thought they were seas. Astronauts Neil Armstrong and Buzz Aldrin discovered something different when they landed in a dark spot named the Sea of Tranquility in 1969. Instead of a sea, the pair uncovered a large lava plane, evidence of an asteroid striking the moon, punching through its center and causing magma to flow up to fill the deep crevice.

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