Conceptual Physics (12th Edition)

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

Chapter 20 - Think and Explain - Page 389-390: 45

Answer

There is no air, or any other physical medium, between other planets and Earth. Sound requires such a medium to travel; it doesn't travel in a vacuum.
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