M101 - Pinwheel Galaxy

The Pinwheel Galaxy (also known as NGC 5457) is a face-on spiral galaxy around 21 million light-years away in the constellation Ursa Major. M101 is a relatively large galaxy. With a diameter of 170,000 light-years, it is seventy percent larger than the Milky Way, has a disk mass on the order of 100 billion solar masses and a small bulge of about 3 billion solar masses.

27/04/2013
40x300secs Subs, Darks, Flats and Bias