MODIFIED MAST ASTRONOMY:COSMIC PERSPECTI
MODIFIED MAST ASTRONOMY:COSMIC PERSPECTI
9th Edition
ISBN: 9780136904496
Author: Bennett
Publisher: PEARSON
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Chapter 23, Problem 31EAP

Choose the best answer to each of the following. Explain your reasoning with one or more complete sentences.

31. Measurements of how orbital speeds depend on distance from the center of our galaxy tell us that stars in the outskirts of the galaxy (a) orbit the galactic center just
as fast as stars closer to the center. (b) rotate rapidly on their axes. (c) travel in straight, flat lines rather than elliptical orbits.

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MODIFIED MAST ASTRONOMY:COSMIC PERSPECTI

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