A few weeks before he died, President William G. Harding toured Yellowstone National Park. He said bluntly, “Commercialism will never be tolerated here as long as I have the power to prevent it.” The U.S. National Park system exists, in part, to protect some of our country’s most pristine wilderness from being destroyed by ventures like construction, mining, and logging. While we’ve been able to create National Parks here in the U.S., nobody has the legal right to do that on the Moon. So what happens to the once-pristine Moon when the space miners show up? Along with private missions...