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Dark Matter and Dark Energy in Galaxy Clusters and Large-Scale Structures
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What is the primary evidence for the existence of dark matter?
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A
The rotation curves of spiral galaxies
💡 Explanation:
The rotation curves of spiral galaxies show that the orbital velocities of stars do not decrease as far as expected based on the visible mass of the galaxy. This suggests that there is a large amount of unseen mass, or dark matter, haloing the galaxy.