Conceptual Physics (12th Edition)

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

Chapter 2 - Think and Explain - Page 36-38: 43

Answer

Nothing is needed to keep asteroids moving.

Work Step by Step

The concept of inertia tells us that an object in motion tends to stay in motion, unless acted upon by an outside force. No force is needed to keep asteroids moving. This is discussed on page 25.
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