Vanguard 3 (international designation 1959 Eta 1) is a scientific satellite that was launched into Earth orbit by a Vanguard rocket on September 18, 1959, the third successful Vanguard launch out of eleven attempts.Read more
Vanguard 3 (international designation 1959 Eta 1) is a scientific satellite that was launched into Earth orbit by a Vanguard rocket on September 18, 1959, the third successful Vanguard launch out of eleven attempts.