The Outer Space Treaty comes into force.
The Outer Space Treaty, formally called the Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, is a multilateral treaty that forms the basis of international space law.
Watch: OUTER SPACE TREATY EXPLAINED!
From the Mr. SBK channel.
Sources and further reading: Wikipedia — Outer Space Treaty (CC BY-SA). Images: Wikimedia Commons.
