Before revision: Humans reached outer space mediated in 1944 (MW 18014) and have sustained mediated presence since 1958 (Vanguard 1 , as well as having reached space directly for the first time on 12.
After revision: )Humans reached outer space mediated in 1944 (MW 18014) and have sustained mediated presence since 1958 (Vanguard 1 , as well as having reached space directly for the first time on 12.