A fascinating geophysics report featured in Nature has resolved a long-standing planetary mystery regarding subtle, multidecadal variations in our planet’s rotation. The peer-reviewed research demonstrates that a powerful gravitational tug-of-war is occurring deep within the planet’s core. The physical friction and gravitational coupling between Earth’s solid inner core and its massive mantle are directly responsible for adding or subtracting fractions of a millisecond from the literal length of our days.
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