Dark matter in the Bullet Cluster celebrates 20 years
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20 years ago, the story of our Universe took an unexpected turn, when dark matter’s existence was confirmed empirically within the natural lab of the Universe: through the science of colliding galaxy clusters. Previously, we could only look at physical systems — individual galaxies, large clusters of galaxies, or the grand cosmic web on large-scales — and infer that something was missing. There were two plausible explanations: either the law of gravity was wrong and needed modifying on large cos
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