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Our Expanding Universe. What is a Theory?. Not a fact A hypothesis that has lots of support Accepted hypothesis. Big Bang Theory. Most popular theory Says that at first matter was in one small area, and than it got so hot it exploded

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## Our Expanding Universe

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**What is a Theory?**Not a fact A hypothesis that has lots of support Accepted hypothesis**Big Bang Theory**Most popular theory Says that at first matter was in one small area, and than it got so hot it exploded This theory suggests that everything is still expanding and growing**What supports the Big Bang Theory?**1. Red Shift: the universe is still expanding 2. Cosmic Microwave radiation found from the Big Bang**Oscillating-Universe Theory**Supports the Big Bang The universe started with a Bang and expands until gravity causes it to have a great crash (get smaller again) and so on We are in a state of expansion**Steady State Theory**The universe has always looked as it does, and its overall composition does not change

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