21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
6th Edition
ISBN: 9780393874921
Author: PALEN
Publisher: Norton, W. W. & Company, Inc.
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Chapter 20.1, Problem 20.1CYU
To determine

List three pieces of evidence supporting the theory that the Milky Way is a spiral galaxy.

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