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A Grand Slam

In a winning move, NASA probe burrows into a comet

The first fireworks this July 4 came from space. At 1:52 a.m. Eastern time, a 372-kilogram copper projectile released from NASA's Deep Impact spacecraft slammed into Comet Tempel 1, producing an incandescent flash. After a second flash a second or so later, the comet belched debris moving at 180 kilometers per hour in a fan-shaped pattern.

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