Cream Border — 2 museum-grade prints in this palette. Voyager 1 launched 5 September 1977 and flew by Jupiter in 1979 and Saturn in 1980, returning images that defined public understanding of the outer solar system. The spacecraft crossed the heliopause into interstellar space in August 2012 — the first human-made object to do so. The Apollo–Soyuz Test Project docked on 17 July 1975 — the first joint US–Soviet spaceflight and the final flight of an Apollo command module. The APAS-75 androgynous docking adapter established hardware standards later used in Shuttle–Mir and International Space Station partnerships.