21st Century Astronomy (fifth Edition)
21st Century Astronomy (fifth Edition)
5th Edition
ISBN: 9780393603330
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 1, Problem 19QP
To determine

The time takes for an observer on Earth to know the star exploded in the Andromeda Galaxy.

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