4 Geography · 4.1.1 Universe, solar system and the Earth

4.1.1.1 Origin of the universe: Big Bang and the expanding universe

The universe began about 13.8 billion years ago in a hot, dense state that has been expanding ever since (the Big Bang); our solar system and the Earth formed much later, about 4.6 billion years ago, from a rotating cloud of gas and dust.

  • APPSC Group 1
  • Advanced level
  • 9 min read
  • Full course

Key terms

  • Big Bang
  • expanding universe
  • Hubble
  • redshift
  • steady state
  • Hoyle
  • nebular hypothesis
  • Kant
  • Laplace
  • planetesimals
  • cosmic microwave background
  • degassing
  • age of the earth

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Mains writingMains writing
  5. Common trapsFoundation
  6. Quick revisionFoundation

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