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What keeps the sun spinning?Nothing keeps the sun spinning. The sun spins under its own inertia and does not need any help to keep it going. Isaac Newton observed that objects in motion tend to stay in motion. This is called the Law of Inertia. It means that if an object is already moving and nothing acts on it to stop it, the object will just keep moving under its own inertia.
For instance, a hockey puck sliding across the parking lot will only stop if it hits a wall or if there is enough friction acting on it to slow it down to a stop. Without an external force like friction, the puck will slide forever under its own inertia.
The Law of Inertia is just a conceptual statement. The more general and more mathematical version of the Law of Inertia is called the Law of Conservation of Momentum. It states that the total momentum of an object stays constant if nothing acts on the object.
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