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WiS│Wonders in Space on Instagram: "The Earth is not a perfect sphere. Its actual shape is called a geoid. A geoid is the shape Earth takes when defined by gravity and rotation, as if oceans covered the entire planet with no tides or currents. Unlike a smooth sphere or an ellipsoid, which accounts for the equatorial bulge, the geoid is slightly uneven because Earth’s mass is not spread out evenly. Mountains, ocean trenches, and variations in rock density cause small bumps and dips, making the su