On 10th October, 1967 a treaty went into force that has gone on to become the backbone for all international space law – a United Nations-approved agreement known as the The Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, but better known today as the Outer Space Treaty. It’s a relatively succinct document of just 17 articles, some as short as a single sentence, but it represented a lot of fundamentally very challenging cooperation at the time. Not least because it came about when the Cold War was in full swing, and both the United States and the Soviet Union wanted to prevent the expansion of the nuclear arms race into space.  In this episode, Arion, Rebecca and Olly explain why the principles of the Antarctic Treaty of 1959 turned out to be a good fit for rules on what can and can't be done in outer space; revisit everyone's favourite topic of property law in the 13th century; and discuss whether Elon Musk will, according to the law, own other planets if he lands on them. Further Reading: • ‘Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, Including the Moon and Other Celestial Bodies’ (US Department of State, 2009): https://2009-2017.state.gov/t/isn/5181.htm  • ‘How an international treaty signed 50 years ago became the backbone for space law’ (The Verge, 2017): https://www.theverge.com/2017/1/27/14398492/outer-space-treaty-50-anniversary-exploration-guidelines  • ‘Who Owns The Moon?’ (Vsauce, 2015): https://www.youtube.com/watch?v=Ks8WH3xUo_E  This episode first aired in 2023 Love the show? Support us!  Join  🌴CLUB RETROSPECTORS🌴to DITCH THE ADS and get an additional full-length episode each SUNDAY…  … Plus, get weekly bonus bits, and unlock over 100 bits of extra content.  Join now with a free trial on Apple Podcasts or Patreon and support our show ❤️ The Retrospectors are Olly Mann, Rebecca Messina & Arion McNicoll, with Matt Hill. Theme Music: Pass The Peas. Announcer: Bob Ravelli. Graphic Design: Terry Saunders. Edit Producer: Ollie Peart Copyright: Rethink Audio / Olly Mann 2025. Learn more about your ad choices. Visit podcastchoices.com/adchoices