Cosmic History

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Cosmic History

• Big Bang Cosmology is a well accepted theory
  (12-16 billion years ago)
• Gravity drives the formation of our Milky Way
  galaxy (11-14 billion years ago)
• Gravity drives the formation of stars, and
  nuclear fusion in stars produces elements such as
  carbon, nitrogen, and oxygen
• Our solar system formed 4.6 billion years ago.
• Our Earth and the other planets in the solar
  system formed around our star The Sun

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Light Travel Time

• Light travels at 300,000 km/s
• Astronomical distances are measured in
  light-years 0.946 1013 km
• Stars in our sky are many light- years away
• Center of the Milky Way is 28,000 light-years
  away
• Galaxies are millions to billions of light-years
  away.

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