NASA spacecraft re-establishes contact with Earth via tech it hasn't used since 1981

Voyager 1 has re-established contact with NASA using a radio transmitter it hasn't relied on since 1981. A command sent by engineers last month caused the spacecraft to shut down its primary X-band radio transmitter, switching instead to a backup S-band transmitter, which had not been used in 43 years. NASA suspects the spacecraft's autonomous fault protection system was triggered.