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The flat rotation curves of spiral galaxies mean that... (remember: ) Group of answer choices The total mass within a radius r is proportional to

The flat rotation curves of spiral galaxies mean that... (remember: ) Group of answer choices The total mass within a radius r is proportional to the radius The total mass within a radius r decreases with radius Galaxies cannot be larger than 10 kpc The total mass within a radius r does not depend on the radius

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