Universe Sandbox Wiki

The material that makes up a spinning object experiences a centrifugal force that works against the force of gravity. If the object spins fast enough, this force can pull the object apart, ripping away fragments or even completely destroying the body. This effect is included in Universe Sandbox as of Update 30.

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An object will begin to fragment once its Angular Speed is larger than its maximum spin rate, which depends on the object's mass and density, as well as the value for gravity in the simulation.[1] One the angular speed reaches three times the maximum spin rate, the object will completely disintegrate into fragments; at smaller angular speeds, a smaller remnant object will be left behind.