This is really cool…the image here shows how much water there is on Earth, if you were to gather it all up in a ball and compare it to the size of the whole planet. It really puts things in perspective, doesn’t it?
Now, take this a step further, and think about the water on this planet compared to others in our solar system. Our little blue marble in space seems to be the gem, the most water-rich planet orbiting this star. Well, it turns out that’s not exactly true, if you count moons at least. Check out the picture below, showing the water on Earth, compared to the estimated water on the moon Europa! In terms of volume, Europa is estimated to have two to three times the volume of water that Earth does. Incredible!