| The Syncom 4 communications satellite was launched from the space shuttle Discovery. Modern communications satellites receive, amplify, and retransmit information back to earth, providing television, telefax, telephone, radio, and digital data links around the world. Syncom 4 follows a geosynchronous orbit—that is, it orbits at the same speed as the earth spins, keeping the satellite in a fixed position above earth. This type of orbit enables uninterrupted communication links between ground stations. |
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