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Gravity and pressure both do lots of things. In the center of a star (such as our sun, Sol) it is the gravitational force of the star's mass which holds it together as a star, rather than an expanding cloud of gas which it otherwise would be, and which also causes the high pressure that exists in the center of the star. Stars are composed of a substance known as plasma, which is a super heated gas in which all the electrons are ionized rather than being bound to atomic nuclei. It is the weight of all this plasma which presses down on the center of the star causing the extremely high pressure and temperature which allows nuclear reactions to take place. Only when atomic nuclei are under enormous pressure will they ever get close enough to undergo nuclear reactions, and that is because they are all positively charged, and therefore repel each other. So gravity and pressure, working together, make it possible for the sun and stars to shine. Without gravity and pressure the universe would be a dark, cold place.

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Q: What does gravity and pressure do?
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