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A galaxy with constant mass density within 20,000 light-years of its center, and zero density beyond that distance.

Sagot :

The Milky Way's rotation curve provides evidence for dark matter. Here's why. The correct answer is in the image

The rotation curve extends far beyond the disk of the Milky Way. Our galaxy belongs to a cluster of about 54 galaxies, the so-called local group. This map shows the distribution of about three-quarters of the galaxy.

The Milky Way and Andromeda galaxies are the largest and most massive galaxies in the Local Group of galaxies. Evidence for the existence of gravitational dark matter is evident in astronomical observations, from early observations of large movements of galaxies within clusters and of the movement of stars and gas within galaxies.

Learn more about A galaxy here:- https://brainly.com/question/13956361

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