The Big Bang


It happened very quickly at the beginning of the Universe.

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In order to explain what happened scientists use measurements of time that are very small as one ten million trillion trillion trillionth of a second.

 

At first…

  • the Universe was unspeakably small and hot – getting larger and cooler ever since.
  • four fundamental force (strong & weak nuclear forces, electromagnetism & gravity) were unified into a single force.
  • gravity was first force to separate, followed by strong nuclear force – this sparked off known as inflation (splashiness) and the Universe suddenly became billions of billions times bigger.

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About one-billionth of one second…

  • about one-billionth of one second after the Big Bang, the Universe lay in of a dense sea of quarks and other particles – tiny piece of anything; atoms, molecules, etc).

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About three minutes…

300,000 years later…

  • the Universe remained completely not transmitting light yet – then it became cool enough for neutrons and protons to capture electrons and form atoms.
  • then the Universe was transparent to light and other electromagnetic energy.


About 100 million years later …

  • about 100 million years after the Big Bang, the first stars began to shine.

 

 

Story of the Universe (Click for enlarge image.)
There is still much to be discovered about the Universe and the Big Bang – recently the scientists have proposed that there must be a fifth fundamental force (known as dark energy)that prevents the Universe from collapsing inwards under the force of its own gravity.

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Back to The Universe page.

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