The spinning of a shrinking nebula marks the transition from a protostar to a star.

Question

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A spinning nebula begins to shrink over time. As the gases of the sphere flatten and condense at the center, it becomes a protostar. Hydrogen atoms eventually begin to fuse into helium which releases a great amount of energy. The rapid release of energy marks the transition to a star. Information can be found in the section Stars and Seas.

The Spinning of a Shrinking Nebula Marks the Transition from a Protostar