Intermediate spiral galaxies Reference Libraries
Pinwheel Galaxy -- Discovered by Pierre Mchain in 1781. M101 was discovered by Pierre Mchain on March 27, 1781, and added as one of the last entries in Charles Messier's catalog. It was the first "spiral nebula" identified as such by William Parsons, the third Earl of Rosse. Although extended 22 arc minutes on photos and quite bright, only the central region of this galaxy is...
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