1. Evidence for The Big Bang
10/12/16
Evidence for The Big Bang
Objective: I will explain the supporting evidence for the Big Bang Theory.
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2. 1) The Universe is Expanding
Edwin Hubble (1929)
observed galaxies were moving away from each other

4. 1) The Universe is Expanding
How?
Hubble noticed a red shift
light being emitted (given off) from the galaxies was shifting to longer wavelengths

8. 1) The Universe is Expanding
Hubble's Law: universe is expanding
New research (1990’s): expansion is accelerating
Dark Energy?

11. 2) Cosmic Microwave Background Radiation
early universe was a white hot hydrogen “soup”
If we look at the "edges" of the observable universe, we should be able to see this heat

13. 2) Cosmic Microwave Background Radiation
this radiation was observed in the 1960's
2003: the Wilkinson Microwave Anisotropy Probe (WMAP) provided us with a picture and measurements to prove this

16. 3) Mixture of Elements in Early Universe
Big Bang predicts the first elements to be produced were Hydrogen, Helium, and Lithium
Therefore, the oldest stars must contain only H, He, and Li.
This has been observed!

17. 4) Observing a Changing Universe
astronomers have observed that the oldest stars and galaxies are much different than those formed more recently
structures in the Universe have become more complex