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Gravity & g-Variation
Move a mass from a planet's core out into space and watch g and its weight change.
About this simulation
A cross-section of the planet paired with a live graph of g versus distance from the centre — rising linearly inside a uniform sphere, peaking at the surface, then falling as 1/r² outside. Dragging a test mass reads off its weight at any depth or height, showing g peaks exactly at the surface.
