Because the Moon is so close to us, and we've landed there already, we sometimes take it for granted, or worse still, underestimate how far away it actually is. In truth, the distance between the Earth and the Moon is enormous. So much so that you could fit every planet in our Solar System between here and there, and there would still be room to spare.
The distance from here to the Moon (although it's moving as we said before!) is 239,000 miles - more than enough room to squeeze the planets in, even Jupiter with its incredible size. Jupiter would soon be the last planet standing though - if they were all assembled so close together, the competing gravitational fields would rip all of the other planets apart and leave them all as rubble orbiting the gas giant.