Conceptual Physics (12th Edition)

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

Chapter 27 - Think and Discuss: 81

Answer

At high altitudes, there are fewer molecules and particles above you than when you are closer to sea level. There are fewer particles above you to scatter sunlight. The sky appears darker.

Work Step by Step

If your altitude were to increase even more, until there were no atmosphere above you at all, you would see a black sky (as astronauts see from the International Space Station, or saw from the lunar surface).
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