the rocket used to launch the satellite became derelict objects that would continue to orbit Earth for many years. Both objects remain in orbit. As Vanguard 1, Vanguard 2, and Vanguard 3 are still orbiting with their drag properties essentially unchanged, they form a baseline data set on the atmosphere of Earth that is over 60 years old and continuing. Vanguard 2 has an expected orbital lifetime of 300 years. See also Timeline of first images of Earth from space Vanguard 1 Sputnik 1 Sputnik (rocket) Weather satellite Timeline of artificial satellites and space probes References External links Historic newsreel footage of the Vanguard II Satellite Spacecraft launched in 1959 1959 in the United States Derelict satellites orbiting Earth Project Vanguard Weather satellites of the United States