Galactic nebulas are irregular masses of gas and dust in a galaxy that shine either by reflecting

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Galactic nebulas are irregular masses of gas and dust in a galaxy that shine either by reflecting light from nearby stars or because their gases are excited to glow by radiation from such stars. Globular clusters are compact assemblies of thousands of very old stars that surround the central disk of a galaxy.

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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