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A fact from Abell 2142 appeared on Wikipedia's Main Page in the Did you know column on 27 November 2008, and was viewed approximately 3,700 times (disclaimer) (check views). The text of the entry was as follows:
Did you know... that Abell 2142, a galaxy cluster, is one of the most massive objects in the universe?
You have copied a passage from the source in your second para. The copy includes an apparent misprint in the original. I think the word "roiling" does not exist, and that "boiling" is meant. Anyway, I demote the page to C class; virtually all the first two paras are verbatim from the source quoted. Macdonald-ross (talk) 16:54, 13 August 2012 (UTC)[reply]
"Roiling" is not a misprint. At m-w.com it is defined as "moving turbulently," which makes it a much better choice here than "boiling."--RichardMathews (talk) 23:18, 14 August 2012 (UTC)[reply]
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