I did not do the math at all correct. (I'm on vacation and apparently left most of my brain cells at home.) I stupidly counted: 9 planets total 2 "ocean" mo

I did not do the math at all correct. (I'm on vacation and apparently left most of my brain cells at home.) I stupidly counted: 9 planets total 2 "ocean" moons (Enceladus + Europa) + Earth = 3 bodies with water. 9 divided by 3 = 30% So that is my half thinking.