Clouds of luminous gas and dust in our galaxy are called a. Galactic clusters b. Galactic nebulas

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Clouds of luminous gas and dust in our galaxy are called
a. Galactic clusters
b. Galactic nebulas 

c. Quasars

d. Cosmic rays

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Related Book For  answer-question

The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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