Top Stone Cold Kansas City Shirt
All of this matter was gravitationally pulled toward each other, just as you’d expect matter to behave. As a result of all of this matter clumping together, the expansion of the universe slowed down. But then suddenly around seven billion years ago, the expansion started to speed up and it’s only gotten faster since. Sometime between 11 billion years and seven billion years ago, dark energy turned on and began dominating the universe.
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