Thread: Once every Billion Years, eh.....
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Old 15-03-2018, 06:37 AM
JA
.....

JA is offline 		 
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 2,976
Once every Billion Years, eh.....
An interesting article on Galaxy rotation, once every billion years .....

http://www.valuewalk.com/2018/03/ast...laxy-movement/

(Better sort that tracking out ....)

Best
JA
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