How many football fields can fit on Neptune?

Answer 1

We assume that Neptune is a sphere. It's diameter is 34,503 miles, so it's radius is 17,251.5 miles. The surface area of a sphere is 4 Pi r2. A pro football field is 120 by 53.3 yards. We need to have the same units on the top and bottom of our fraction,

so convert 17,251.5 miles to yards using * ( 5280 ft/mile ) / ( 3 yards/foot ) and squaring it for area.

(4*3.1415927* 17251.5 * (5280/3)2 ) / ( 120 * 53.3 ) = 104,991,372 (truncated to an integer), or just under 105 million football fields.