Answer
Light has a large but finite speed.
Work Step by Step
When you look into the sky, you are receiving the light that left the distant galaxy a long time ago.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 26 - Think and Explain - Page 501-502: 75
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