Dark side of the Moon: Music, myths and aliens

A Chinese robot has started exploring the far side of the moon. The Chang'e-4 probe will explore the surface and carry out geological experiments. China plans to follow this up with further missions to return moon rock to laboratories on Earth. But it's not just scientists who are fascinated with the moon's hidden face. Musicians, film-makers and, of course, conspiracy theorists have all been inspired by that secret, barren landscape.