Fortunately, the Army had been working on their own parallel project, The Explorer, which was successfully launched in January 1958, but the U.S. had barely managed to catch up before they were surpassed again as Yuri Gargarin became the first man in space in April 1961.
Felizmente, o Exército tinha estado a trabalhar no seu projeto paralelo, The Explorer, que foi lançado com êxito em janeiro de 1958. Mal os EUA conseguiram recuperar o atraso, foram de novo ultrapassados, quando Yuri Gagarin veio a ser o primeiro homem no espaço em abril de 1961.