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What is the evidence that a large proportion of the mass of the universe is in the form of dark matter? fast slow not observable

What is the evidence that a large proportion of the mass of the universe is in the form of dark matter?

fast slow not observable observable 10 90 50 In 1933 astronomers noticed that galaxies at the edge of the Coma cluster of galaxies were moving much too to remain in the cluster, given the amount of mass that was observable in the cluster. lay hidden in the cluster. In This led to the suggestion that some "dark" matter that was the 1970s many observations have confirmed that the motion of galaxies and stars cannot be explained by the gravity exerted simply by the usual matter. In fact, the observable matter constitutes only about % of the matter necessary to explain the motion we observe in the universe. Thus, dark matter is conjectured to account for the missing % of matter that is needed to explain the motion of galaxies and stars.

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