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We need dark matter. For starters, it is a form of cosmic glue that binds our galaxy together and provides the necessary gravitational force for galaxies to cluster around one another. If dark matter does not exist, it means that our understanding of gravity on the largest scales is wrong. This is unthinkable to most astronomers, who continue to pin their hopes on dark matter and use observations of the way galaxies move and rotate to help pin down its properties.
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