Black hole jets measured for first time and rival the power of 10,000 suns - Science Daily

Earth's center of mass does not stay perfectly still. As water, ice, and air move around the planet with the seasons, they redistribute enough weight to push the center of mass back and forth by fractions of an inch relative to Earth's geometric center. NASA scientists carefully track this subtle motion because Earth's center of mass serves as an essential reference point for satellite navigation and measurements of surface elevation.

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