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Physics / College Physics 1 / Chapter 34 / Problem 18

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

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Discuss the possibility that star velocities at the edges

Chapter 34, Problem 18

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QUESTION:

Problem 18CQ

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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QUESTION:

Problem 18CQ

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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Solution 18CQ

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If the star velocities at the edge of the galaxies are greater than expected due to some unknown properties of gravity, then the gravitational law governing the motion of objects around us will be void. If the mention property of gravity is true, then gravity will be stronger at larger distances.

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