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THE BIG BANG THEORY. How was the Universe formed? What is the evidence for the formation of the Universe?. What is the Big Bang (BB) theory?. = a theory that explains the origins of the universe

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The big bang theory
THE BIG BANG THEORY

  • How was the Universe formed?

  • What is the evidence for the formation of the Universe?


What is the big bang bb theory
What is the Big Bang (BB) theory?

= a theory that explains the origins of the universe

  • Billions of years ago, all energy in the universe was compressed into an extremely small space (smaller than the size of a grain of sand).

  • About 14 billion years ago (bya), a sudden event (the BB) sent all of the energy outward in all directions


What happened
What happened?

  • Unimaginably high temperatures & pressure

  • As the universe expanded

    • Temperatures cooled

    • Matter started to form

    • Some of the matter evolved into clumps that formed galaxies

  • The Universe continues to cool and expand!


What is the fate of the universe
What is the fate of the universe?

2 thoughts:

  • Endless expansion - it will go on forever

  • “The Big Crunch”- turn cold and collapse on itself


Evidence for the big bang
Evidence for the Big Bang

  • Red-Shifts observed in light spectra from galaxies means the universe is expanding

  • Cosmic Microwave Background Radiation

  • Abundance of hydrogen and helium.


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