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Chapter 23, Section 2
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William Herschel - Wikipedia
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The Milky Way Galaxy
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Milky Way - Wikipedia
The Shape of the Milky Way from Starcounts | Astronomy 801: Planets, Stars, Galaxies, and the Universe
Photographic Astronomy
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William Herschel - Wikipedia
Lecture 22: The Milky Way Galaxy
Chapter 21: The Milky Way. William Herschel's map of the Milky Way based on star counts In the early 1800's William Herschel, the man who discovered the. - ppt download
Why can't we see the center of the Milky Way?
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