Why Do Planets Rotate?

We know the effects of the planets spinning, but why do they do it?

RELATED TAGS: PHYSICS
planet-spinning
Q: Why do planets rotate? I have been told the effects of their spinning, but never why they spin in the first place. — Carson Lee Fifer Jr., Alexandria, Va.   A: To answer this question, it helps to picture a game of pool. Hit the cue ball, and sometimes it strikes only a glancing blow on your target, setting it into a spin instead of launching it across the table. Most experts believe planets probably acquired their spin in much the same way, when clumps of matter collided during th...
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