P6.2.3 Galaxies and the Universe

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Last updated 11:17 PM on 8/1/26
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Explain the Big Bang theory

  • Around 13.8 billion years ago, the Universe expanded from a single point of high density and temperature

  • As a result of the initial explosion, the Universe continues to expand

  • Supported by the observations that many distant galaxies are moving away from us, which means the Universe must be expanding

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