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1. The big bang was the first threshold.

2. The big bang happened 13.7 billion years ago.

3.  The big bang was very short it was only a few seconds long.

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Threshold 1: The Big Bang | Big History Project

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1. Big Bang - the rapid expansion of matter from a state of extremely high density and temperature that according to current cosmological theories marked the origin of the universe.

2. Goldilocks Conditions - the conditions that happened at the right time, were just right to make every thing perfect.

3.

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A Big History of Everything (Clip 8:25 - 12:04) | Big History Project

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1. The Big Bang created the universe.

2. In the first few seconds many things could have gone wrong and we would not be here.

3. Everything that happens now is because of the big bang.

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summary of the big bang theory big history - Google Search

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1.Right after the Big Bang there was much more complexity in the universe.

2. We would not be here today if the Big Bang did not happen.

3. All the other thresholds would not have happened if the big bang did not come first.

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1. Space

2. Universe Today

3. ZME