If you collected all of Earth’s water into a sphere, how big would it be?
Our water sphere would have a diameter of 1,385 kilometers (about 860 miles), and span the distance from Salt Lake City, Utah to Topeka, Kansas. A sphere this far across would have a volume equal to about 1,386 million cubic kilometers (roughly 332,500,000 cubic miles).
By comparison, the Earth measures a staggering 12,256 km in diameter, dwarfing the little blue sphere — a “little blue sphere” that contains more than enough water to cover over 70 percent of our planet’s surface, and fill every life form on Earth with H2O molecules. (Those looking for a similar size comparison at home can use a basketball to represent the dry Earth, and a nickel to illustrate the diameter of our water sphere.)