Discuss the possibility that star velocities at the edges of galaxies being greater than
Chapter 34, Problem 18(choose chapter or problem)
Discuss the possibility that star velocities at the edges of galaxies being greater than expected is due to unknown properties of gravity rather than to the existence of dark matter. Would this mean, for example, that gravity is greater or smaller than expected at large distances? Are there other tests that could be made of gravity at large distances, such as observing the motions of neighboring galaxies?
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