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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 drdebug on Wednesday March 14, 2018 @02:07PM (#16586905)
Ok, my mind is boggled too... Anything we can read on the topic ?
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Re:All disk galaxies rotate once every billion years: study by Retra on Wednesday March 14, 2018 @07:31PM (#16589319)
What topic? Basic geometry?
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