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A comment on All disk galaxies rotate once every billion years: study. Parent comment

Re:All disk galaxies rotate once every billion years: study by kwoff on Wednesday March 14, 2018 @02:12PM (#16586955)
Planets orbit around the center of mass. It's coincidental that the center of mass is (at least in our case) at the sun's location, because the sun has most of the mass.
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