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A star is a luminous, approximately spherical plasma that converts mass into energy by nuclear fusion reactions in its core. Stars mainly convert hydrogen into helium during the longest stage of their evolution known as the main sequence. Stars are formed from clouds in the interstellar medium known as nebulae. Their fate depends primarily on their mass. They may end up as white dwarfs, neutron stars, or black holes. Stars that are very massive explode as supernovae. The Sun, which is at the center of our solar system, is an example of a star.

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10y ago

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