Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 11 - Reading Check Questions (Comprehension): 30

Answer

The motion of stars and galaxies cannot be explained by only the gravitational pull of visible matter; there appears to be something else (dark matter) doing the pulling.

Work Step by Step

This is discussed on page 222.
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