#PPOD: This "family portrait" of Uranus' five largest moons was compiled from images sent back on Jan. 20, 1986, by the Voyager 2 spacecraft. In this comparison, we see the relative sizes and relativities of the satellites. From the left, in order of increasing distance from the planet, they are Miranda, Ariel, Umbriel, Titania, and Oberon. Credit: NASA/JPL