If you lined up all of the planets in our solar system with the exception of Pluto, they would fit neatly between the Earth and the Moon with only about 2,729 miles to spare.
Redditor CapnTrip made this illustration of this fascinating fact. Frasier Cain of io9 came up with slightly different numbers from NASA, but found that CapnTrip was mostly correct.
Add in Pluto and the number drops to about 1,299 miles.