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Old 04-03-2016, 10:09 PM
wayne anderson (Wayne)
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wayne anderson is offline
 
Join Date: Jan 2010
Posts: 339
It is interesting how what is defined as a Nebula changes with time and knowledge, when originally discovered the Triangulum galaxy M33 was defined as a Nebula then re defined as a Galaxy now the M33 Galaxy is known to also contain the NGC 604 Nebula.

http://hubblesite.org/newscenter/arc...96/27/image/a/
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