With new moons popping up regularly in recent decades the number of moon in this solar system has expanded rapidly
It's nice to have an "at a glance view"
to keep tabs on just how all of these moons stack up together and relate to one another. Its also great to have our own moon and earth with which we are most familiar for comparison.
By Originally uploaded from NASA by Bricktop; edited by Deuar, KFP, TotoBaggins, City303, JCPagc2015 - solarsystem.nasa.gov, Public Domain, Link