This guy's made $9 million off this.
In 1967, the United Nations signed the Outer Space Treaty, which forbids any government from claiming the Moon (or any part of space for that matter). The treaty failed to mention anything about private individuals or corporations, so a second treaty forbidding anyone from claiming ownership of extraterrestrial real estate was proposed. Only a handful of nations (none of them space-faring) signed this treaty. This left a loophole in international law as big as the void of space itself.
In 1980, Dennis Hope sent letters to the United Nations, the United States government and the government of the former Soviet Union, informing them that he was officially claiming ownership....