Who owns the Moon?
According to the United Nations Outer Space Treaty, no nation can claim sovereignty over Earth's lunar satellite (AKA the Moon).
However not every country subscribes to this intergalactic law. In 1967, 107 ‘space-faring’ countries signed the treaty (no one had won the Space Race yet), and China joined in 1987.
When Neil Armstrong planted the American flag on the Moon in 1969, there was panic over the legal and political implications. No fear - it was purely customary, and no one owns the moon to this day.
But, that could change soon.
Dr Marek Kukula, from the Royal Observatory Greenwich, explains how our daily lives are increasingly reliant on outer space.
As technology advances and the commercial space industry booms, the question of ownership is becoming more pressing.
Some nations, such as the USA, think that the Moon and other asteroids are "global commons", and private entrepreneurs should be able to mine them for resources - providing they are licensed to, and comply with space law.
However, other countries like Russia think that they should belong to humanity as a whole.
Many experts are concerned that if the law is not revised, there could be a great space stand-off... but we all know Wallace and Gromit have dibs on the cheese.