small set of moons we see now might have mostly formed from the result of that collision. Here are images of the five biggest moons Oberon (ρ = 1.63 gm/cm 3 ), Titania (ρ = 1.71 gm/cm 3 ), Ariel (ρ = 1.66 gm/cm 3 ), Umbriel (ρ = 1.39 gm/cm