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Why does the Milky Way rotate?
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Galaxy rotation curve - Wikipedia
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All Galaxies Take a Billion Years to Rotate. Which Is Really Cool, and Totally Weird.
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Super Spirals Spin Super Fast
Disk galaxies rotate once every billion years, no matter their size | Science | AAAS
All disk galaxies rotate once every billion years | Astronomy.com
Skylight: How Does Our Solar System Move Around the Milky Way? - YouTube
