February's Chileearthquakewas so powerful that it likely shifted anEarthaxis and shortened the length of a day—a NASA revelation that helped make this story National Geographic News's tenth most visited of 2010.
By speeding up Earth's rotation, the magnitude 8.8 earthquake—the fifth strongest ever recorded, according to theUSGS—should have shortened an Earth day by 1.26 millionths of a second, according to new computer-model calculations by geophysicist Richard Gross ofNASA's Jet Propulsion Laboratoryin California.
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