Conceptual Physics (12th Edition)

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

Chapter 26 - Think and Discuss - Page 502-503: 85


Yes. Planets are illuminated by the sun's rays, so they will cast shadows even if nothing is behind them. (This may remind you about the tree falling in the forest without anyone around to hear it...) This is apparent when the Earth or its moon are positioned in such a way that one of them intercepts the shadow of the other, making it visible. This is called an eclipse.

Work Step by Step

This is discussed on pages 493-495.
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