gm/cm 3 ), Titania (ρ = 1.71 gm/cm 3 ), Ariel (ρ = 1.66 gm/cm 3 ), Umbriel (ρ = 1.39 gm/cm 3 ), and Miranda (ρ = 1.20 gm/cm 3 ): Miranda has a dramatically fractured surface, as if it was stuck together from several large pieces. It is believed