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Before stars existed, the Universe was relatively cool and uniform. Gravity brought together individual hydrogen and helium atoms to form gas clouds. Eventually these got so dense, they ignited as stars. Groups of stars formed galaxies. Galaxies formed galaxy clutsers. Galaxy clusters formed superclusters. From that point on, the universe had billions and billions of long lasting energy sources.
Before stars existed, the Universe was relatively cool and uniform. Gravity brought together individual hydrogen and helium atoms to form gas clouds. Eventually these got so dense, they ignited as stars. Groups of stars formed galaxies. Galaxies formed galaxy clutsers. Galaxy clusters formed superclusters. From that point on, the universe had billions and billions of long lasting energy sources.
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