Spiral galaxies a. Are readily visible as such to the naked eye b. May be dark or

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Spiral galaxies
a. Are readily visible as such to the naked eye
b. May be dark or bright
c. Are usually similar to our galaxy
d. Originate in supernova explosions

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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