21st Century Astronomy 6E
21st Century Astronomy 6E
6th Edition
ISBN: 9780393690675
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton
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Chapter 19, Problem 21QP
To determine

The reason why some galaxies have regions that are relatively blue and the other regions appear redder, and what does this variation indicate.

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Are the galaxies red-shifting or blue-shifting? Explain. (You may find the big-bang theory helpful). Andromeda galaxy is currently approaching our galaxy with a radial velocity of 266 km/sec. How far is our galaxy from Andromeda? (Hubble’s constant, H, is 73 km/sec/MParsec). When can the two galaxies be anticipated to collide?
What is the recession speed of a galaxy cluster which is 50Mpc away from Earth? Is the light from the galaxy cluster red-shifted or blue shifted?
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