The Tracking and Data Relay Satellite is successfully launched aboard a Lockheed Martin Atlas IIa rocket.

The Tracking and Data Relay Satellite-I (TDRS-1) is successfully launched aboard a Lockheed Martin Atlas IIa rocket from Cape Canaveral Air Force Station, Fla. TDRS-I replenishes the existing on-orbit fleet of six spacecraft. The TDRS System is the primary source of space-to-ground voice, data and telemetry for the Space Shuttle. It also provides communications with the International Space Station and scientific spacecraft in low-Earth orbit such as the Hubble Space Telescope. This new advanced series of satellites will extend the availability of TDRS communications services until about 2017. Liftoff occurred at 5:59 p.m. EST. [Photo by Anita Barrett