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Astronomy · L4 · From differential gravity to tidal locking

The causal chain from differential gravity, through tidal bulges and torque, to synchronous rotation.

Astronomy
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Differential gravityacross an extended body(a_tidal ∝ 2GMR/d³)Tidal bulge raisedon near and far sidesInternal friction lagsthe bulge behind rotationMisaligned bulge exertstorque on the perturberAngular momentum exchangedbetween spin and orbitSynchronous rotation(tidal locking)Is body insidethe Roche limit?Self-gravity overwhelmedBody disrupted into ring/fragmentsSelf-gravity holdsBody remains intactYesNo
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