Assuming the known theory of gravity applies, what could we infer from the fact that stars farther away from the center of the Andromeda galaxy move about at nearly the same speed as those stars closer to the core of the galaxy?
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sorry don't know the right answer
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Even though the mass distribution of the galaxy is more concentrated at the center, there is still a certain amount of mass between the closer stars and the farther stars so that gravitational force provides sufficient centripetal acceleration to maintain the rotational speed of the farther stars.
Explanation:
centrepetal acceleration a= -v^2/r
the velocity(v) is more or less the same. So to comfortably satisfy this formula the gravitaional force provided from the gravitaional mass of the stars should generate adequate centrepetal acceleration to maintain the rotational speeds(v) of the farther stars(r)
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