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The massive earthquake that struck Chile may have shifted Earth's axis and created shorter days, scientists at NASA say. The change is negligible, but permanent: Each day should be 1.26 microseconds shorter, according to preliminary calculations. A large quake shifts massive amounts of rock and alters the distribution of mass on the planet. When that distribution changes, it changes the rate at which the planet rotates. And the rotation rate determines the length of a day...
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