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34.1 Exercise 18

Avg difficulty 2.5

(a) What is the approximate speed relative to us of a galaxy near the edge of the known universe, some 10 Gly away? (b) What fraction of the speed of light is this? Note that we have observed galaxies moving away from us at greater than 0.9c0 . 9 c.

OpenStax College Physics 2e, 34.1 Cosmology and Particle Physics, exercise 18

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.