Discuss the possibility that star velocities at the edges of galaxies being greater than expected is due to unknown propertiesof gravity rather than to the existence of dark matter. Would this mean, for example, that gravity is greater or smaller thanexpected at large distances? Are there other tests that could be made of gravity at large distances, such as observing themotions of neighboring galaxies?

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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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