Which of the following does not fit with the others on the list? Please explain your reasoning.
 Galaxy M81
 Black Eye Galaxy
 Pinwheel Galaxy
 Andromeda Galaxy
 Sombrero Galaxy
Of the 5 galaxies on the list, the Sombrero Galaxy is the only one that is not clearly a spiral galaxy. While some sources do describe the Sombrero Galaxy as a spiral galaxy, most acknowledge that it has an usual shape that differs from most spiral galaxies.