Pinwheel Galaxy

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{{Galaxy | name = Pinwheel galaxy | image = Image:M101 hires STScI-PRC2006-10a.jpg The Pinwheel Galaxy by HST | type = SA(sr)c | epoch = J2000.0 | ra = 14^h 3.2^m 12.4^s | dec = +54° 20' 55" | dist_ly = 27 million ly | appmag_v = +7.5 | size_v = 27' × 26' | constellation name = Ursa Major | radius_ly = 85,000 | absmag_v = -21.6 | z = 0.0013 ±0.0002 | notes = none | names = M101, NGC 5457 }}

The Pinwheel Galaxy (also known as Messier 101 or 'NGC 5457) is a spiral galaxy about 27 million light-years away in the constellation Ursa Major. M101 is the brightest member of the M101 group of galaxies.

On February 28 2006, NASA and the ESA released a very detailed image of Pinwheel Galaxy, which was the largest and most detailed image of a galaxy by Hubble at the time ^[1]. The image was composed from 51 individual exposures, plus some extra ground-based photos. The recessional velocity of M101 is estimated to be between 330 and 450 km/sec. Template:Clear

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