Differential rotation
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Differential rotation is seen if parts of a rotating object move with different angular velocity. (to put it short and non-scientific, parts at different distances from the rotation axis make a different number of rounds at a given time interval). This indicates that the object is not solid. In fluid objects, such as accretion disks this leads to shearing. Usually galaxies and protostars show differential rotation; also the Sun, Jupiter and Saturn show differential rotation.
