SPACE
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The find sheds new light on the role such huge collisions played in galactic evolution long ago.
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A large coronal mass ejection from the active sun could affect entire continents, scientists say.
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In 'After Earth,' humanity is faced with a choice: Leave the planet, or die off trying to remain on it.
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Opportunity passed the Apollo 17 moon buggy, which covered 22.21 miles back in 1972.
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The May 31 flyby of 1.7-mile-long 1998 QE2 poses no threat to Earth.
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