How many times faster would a star’s orbital velocity be at the Sun’s position, compared with that of a star orbiting at 5.5...(continued)?
...times the distance from the galactic center, assuming that dark matter is not a factor and that all the mass of the luminous matter can be considered to reside in the galactic center? Assume all the mass of the galaxy is at its center, so the same amount of mass is holding both of these stars in their orbits. If I do this, the mass of the galaxy actually doesn't matter for computing the ratio of the velocities.
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