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The Sun's gravity is immense; at every moment, the combined gravity of all that mass is trying to crush the star down to a point. But the Sun is also very hot and very DENSE, and these forces, and the nuclear fusion explosions constantly happening within the Sun, force the Sun's mass to spread out into space.

The Sun neither collapses nor explodes, because of the precise balance between the inward force of gravity and the outward forces of radiation and pressure.

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