File:M101 WF SDSSsdida (26149661480).jpg

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Messier 101 - Pinwheel Galaxy Credit: SDSS / Giuseppe Donatiello

(J2000) RA 14h 03m 12.6s +54° 20′ 57″ M101 or NGC 5457 is a face-on spiral galaxy distant 21 million light-years in Ursa Major, first discovered by Pierre Méchain on March 27, 1781.

With a diameter of 170,000 light-years it is roughly equal the size of the Milky Way. M101 has five prominent companion galaxies: NGC 5204, NGC 5474, NGC 5477, NGC 5585, and Holmberg IV.
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Source M101 WF SDSSsdida
Author Giuseppe Donatiello

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Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
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This image was originally posted to Flickr by gjdonatiello at https://flickr.com/photos/133259498@N05/26149661480. It was reviewed on 30 August 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-zero.

30 August 2017

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