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cl0ckt0wer
on March 14, 2018
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All disk galaxies rotate once every billion years:...
https://www.youtube.com/watch?v=buqtdpuZxvk
https://xkcd.com/1053/
TileHalo
on March 14, 2018
[–]
https://www.youtube.com/watch?v=XfcC6FYyL4U
EDIT: Stephen Hawking singing Galaxy song
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