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The Big Bang
Einstein’s Theory of Relativity- allow us to rewind universe backwards.
- average density of matter was much higher
- further back, universe might have had infinite density.
Expand from incredibly small volume of space in short period of time called the…
(indicate start of expansion)
Happen approx. 14 billion years ago.
Observations made to predict happening:
- Measurement of how much energy and matter there is.
- type of energy in universe.
Cannot trace before: - Theorists- before Big Bang wasn’t time, space or any matter that existed.