Between 1969 and 1972 six Apollo missions returned to Earth with Moon rocks. It was hoped that they would unlock lunar secrets but they also ended up teaching scientists more about the creation of the Earth and the universe beyond
Notes
Title from resource description page (viewed February 24, 2021)
Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, Including the Moon and Other Celestial Bodies (1967 January 27) fast (OCoLC)fst01774206