M74 is an Sc galaxy, meaning that it has "loosely wound spiral arms, clearly resolved into individual stellar clusters and nebulae." This image was created with data recorded in 2003 and 2005 by Hubble's Advanced Camera for Surveys, and depicts the galaxy in all its 30,000 light-years-across glory. A major component of the data is hydrogen emissions, which create the patches of red glow. It's kind of hard to contextualize or grasp, but M74 is really out in the universe right now, just chillin'. More here.