> If you look up "all of Earth's water in a ball," [2] it's about a quarter the size of the moon. Are you sure about that math? According to your [2] the diame

> If you look up "all of Earth's water in a ball," [2] it's about a quarter the size of the moon. Are you sure about that math? According to your [2] the diameter of the water ball is 1384 km while the diameter of the moon is about 3,475 km. The volume of the water is less than a tenth of the volume of the moon: ((1384/2) ^ 3) / ((3475/2) ^ 3) => ~6.3%