Why do cosmic bodies such as planets, stars, satellites revolve?
What made them to revolve after the formation of universe?
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1Possible duplicates: http://physics.stackexchange.com/q/24888/11062, http://physics.stackexchange.com/q/12140/11062 and the links therein... – Waffle's Crazy Peanut Jul 06 '13 at 05:49
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@Crazy Buddy: Those questions look like duplicates of each other. – Dan Jul 06 '13 at 07:34
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The short answer is: angular momentum conservation. Angular momentum equates to the product of moment of inertia times angular (rotational) velocity. When a gas or dust cloud contracts under the influence of gravity and forms a more compact cosmic body, any nonzero total angular velocity will increase due to the moment of inertia decreasing.
Johannes
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