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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 michaelsbradley on Wednesday March 14, 2018 @04:55PM (#16588213)
Homopolar motor, maybe?
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Re:All disk galaxies rotate once every billion years: study by 8bitsrule on Wednesday March 14, 2018 @11:25PM (#16590217)
I was just going to say: all 33-1/3 rpm records - regardless of their thickness or chemistry - are observed to rotate at about the same rate, regardless of record size.

And (I'll note that) the drive belts are usually hidden from view.

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Re:All disk galaxies rotate once every billion years: study by michaelsbradley on Wednesday March 28, 2018 @08:14PM (#16703365)
Interesting...

http://www.ptep-online.com/2018/PP-53-01.PDF

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