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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 11 - Reading Check Questions (Comprehension) - Page 223-224: 30
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
