Galaxies are collections of stars and gas that are gravitationally bound to one another. Galaxies can appear differently depending on their orientation within our line of sight. When three-dimensional objects are projected onto our two-dimensional sky, it's difficult to tell what their true shapes are. This is analogous to the figure at right of coins at different orientations. All of the coins are round, but only face-on coins appear as such. Edge-on coins appear thin and flat, while the others appear as something in between. Given this concept, order the galaxies from most edge-on to most face-on. Assume that all of the galaxies are perfectly round and that any apparent elongation is due purely to their orientation.