In the study of the cosmos, exceptions play a curious role. They start as challenges to established science, disruptions to theories astronomers worked years to arrive at. They push the frontiers of science, finding patterns behind the non-sequitur, often uncovering a hidden facet of the universe. For example, until 1998, scientists believed that cosmic expansion would slow down. But, in a challenge to gravity, they found out it was speeding up. The unknown force driving this........

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