The Big Bang Theory
By: Amal Imran and Sara Khan
The Beginning of the Universe
- The universe was born approximately 14 billion years ago
- An explosion occurred that created time,space, and matter
- It started out as a single atom but became bigger than a galaxy
In order.....
- Formation of hydrogen atoms (13.76 billion years ago)
- Sun forms 5.01 billion years ago
- Earth forms 4.62 billion years ago except there is not any oxygen
- Formation of the first cell occurrs 3.72 billion years ago (Prokaryotic/single cell)
- 3.3 billion years ago oxygen levels start to increase due to photosynthesis
- 540,000,000 years ago, the cambrian explosion occurrs
- Mollusks, arthropods, ecinodermata, crustaceans and myriapedes
- Finally, homo sapiens evolve 200,000 years ago (humans)
Who Proposed the theory?
George Lemaitre and Edwin Hubble proposed the theory in 1927.
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Extinctions
The five major extinctions occured 450, 375, 250, 220, and 60 hundred thousand years ago