Messier 101 “Pinwheel Galaxy” a face on spiral galaxy in constellation Ursa Major 21 million light years away. Comparable in size to our milky way galaxy its diameter is an estimated 170,000 light years across. Notable for its high population of H II regions, many of which are very large and bright. Luminance layer from 8 inch RC telescope color and Ha mixed from 2 systems 6inch Newtonian and 8 inch RC. Fairly long exposure time on this most of it is in color from the 6 inch Newtonian.