Messier 100, or M100, is a grand design spiral galaxy that contains over 100 billion stars. This Hubble Space Telescope image was made in 2009, but there's even more history here; look carefully for the "small spot that is a light echo from a bright supernova that was recorded years before the image was taken."
Fun fact: French astronomer Charles Messier (1730-1817) was looking for comets, which is how you got to be a superstar astronomer in those days. He kept getting distracted by fuzzy non-comet objects that we now know to be star clusters, nebulae, galaxies and so forth. He made a list of over 100 such objects so he would know to ignore them when he observed them. He did in fact discover a dozen or so comets, but today is remember for the Messier Objects, his "stuff to ignore" list.