Which Apollo mission is #Artemis I most analogous to? One answer is Apollo 4 (SA-501), the first "all-up" uncrewed test flight of the Saturn V rocket, which launched from @NASAKennedy 55 years ago today! 🧵 1/3 #NASAhistory https://nitter.net/NASAhistory/status/1590358556695330816#m