| Galaxy Masses |
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| • | Rotation
Curves of Spiral Galaxies: |
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| • | This
just comes from Newton, by equating |
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| gravity
to centripetal acceleration. This |
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| produces
Kepler’s third law, and “Keplerian” |
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| orbital
velocities around point sources fall off |
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| as
r-1/2. How
about for galaxies? |
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