The Big Bang Theory

� Since the 1880s, scientists have observed that light coming from distant stars has a red shift, showing those stars are moving away from us at high speeds.

� 1920s - theory that the universe was created by a huge explosion, and all matter in the universe is still flying away from that explosion at enormous speeds.

� Named the Big Bang Theory around 1930.

http://science.howstuffworks.com/big-bang-theory1.htm

Oscillating Theory � Most astronomers agree that the Universe is expanding.

Some believe that at some stage in the future, the Universe will stop expanding and begin to contract.

� Oscillating means forward and backwards motion or expansion and contraction of the Universe.

� Universe collapses under its own weight - The Big Crunch.

� Expansion of the Universe – The Big Bang

http://www.universetoday.com/tag/oscillating-universe-theory/

Steady State Theory

� This holds that the universe looks essentially the same from every spot in it and at every time.

� Universe has no beginning and no end. � Matter is continuously created out of

nothing. � Support began to decline in 1960s

(leftover radiation from Big Bang was discovered)