Tidal force

secondary effect of the force of gravity of one body on another

Tidal force is caused by gravity and makes tides happen. This is because the gravitational field changes across the middle of a body (the diameter).

Comet Shoemaker-Levy 9 after breaking up under the influence of Jupiter's tidal forces.

Other websites

http://burro.astr.cwru.edu/Academics/Astr221/Gravity/tides.html

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