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Hydrogen gas makes first stars

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TIME: one billion years

. Now that the radiation has cooled and decoupled from the matter, and almost all the electrons are bound up to nuclei in hydrogen, helium and lithium atoms, gravitational forces become important. Small fluctuations in the matter density and gravitational field begin to grow and coalesce. Hydrogen gas is pulled together by gravity until the force causes the gas to collapse and ignite through hydrogen fusion to form the first stars.

How old is the Universe? // Structure of the Universe // The Big Bang // Before the Big Bang? // What about string theory?

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