M94, aka NGC 4736, is a spiral galaxy in Canes Venatici. Its bright inner ring is presumed to be a region of very active star formation. The much dimmer outer ring is a complex structure when viewed in UV and IR. A 2008 study stated M94 had little to no dark matter present, a controversial conclusion.
Technical details as follows:
Imaged by SSRO at New Mexico Skies in 2007 using a 16″ RCOS @ f/8.7, SBIG STL11K, and Paramount ME. Image scale 0.53″/pixel. LRGB with 7 hours Lum and 2.5 hours RGB/channel. Calibration in Maxim, alignment in Registar, integration in Sigma Combine, and everything else in Photoshop.