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m51_filtered.jpg

What was later known as the Whirlpool Galaxy was discovered in 1774 by Charles Messier, and is designated as M51. Its companion galaxy, NGC 5195, was discovered in 1781 by Pierre Méchain.

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M81

07/10/08

Messier 81 (M81, NGC 3031) in Ursa Major is an easy target for amateur astronomers. It has a little dark matter, as its rotation curve was found to fall off in the outer regions; this is in contrast to many galaxies for which the rotation curve increases outward.

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