NASA Introduces Mercury Astronauts (1) tv-pg Play video Select your TV provider to log in to have full access to videos Select your TV provider See all providers Don't see your TV provider? Learn more You can access this video on the free HISTORY® app. *You must verify your TV provider towatch this video on the App Your Parental Control settings do not allow you to view this content. NASA Introduces Mercury Astronauts (1 min) tv-pg At a press conference in Washington, D.C., on April 9, 1959, NASA introduces the Mercury Seven to the public. The seven astronauts, selected from a pool of 508 military test pilots, were chosen for the newly formed Manned Space Program.