The Moon has 14.6 million square miles of land. The part actually worth owning is the rim of one crater 13 miles across. Shackleton crater sits at the lunar south pole. A few ridges on its rim catch sunlight up to 90% of the year, which makes them the only real estate on the Moon where solar panels run nearly nonstop. A few hundred feet away, the crater floor hasn't seen the sun in billions of years, and it holds temperatures below -300°F. Cold enough to trap water ice. Water is the whole…