Earth's Center of Mass Shifts Less Than Expected, NASA Study Reveals

The ground beneath us is, in the most literal sense, always shifting—not tectonically, but gravitationally. NASA scientists have discovered that Earth's center of mass wanders several millimeters each year as monsoon rains, seasonal snowpack, ocean currents, and atmospheric systems redistribute the planet's weight, and that this wandering is measurably smaller than our models had foreseen. In the long tradition of science humbling its own predictions, this finding invites a quieter, more precise reckoning with how intimately the planet's balance is tied to the movement of water and air—the ver