The moon has been in plain view for all of human history, but it's only within the past few decades that it's been possible to travel there. And for just about as long as the moon has been within reach, people have been arguing about lunar property rights: Can astronauts claim the moon for king and country, as in the Age of Discovery? Are corporations allowed to expropriate its natural resources, and individuals to own its real estate? read more at popularmechanics.com