Home worldnews Astronomers discover that all disk galaxies rotate once every billion years, no matter their size or shape. Astronomers discover that all disk galaxies rotate once every billion years, no matter their size or shape. 3/15/2018 12:07:00 AM A+ A- Print Email http://ift.tt/2Dpmfax via /r/worldnews http://ift.tt/2DrdfBw worldnews Tweet Share Share Share Share Share
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