Mars 1

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March 21 in Universe History: Space Missions, Satellites and Exploration

March 21, 2026
1963 On 21 March 1963, transmitters aboard the Soviet Mars 1 probe fell silent. The final radio contact occurred when the craft was about 106 million km from Earth, ending communications during cruise and leaving it to proceed toward its planned Mars flyby without further telemetry, after earlier relays had returned measurements of interplanetary conditions between Earth and Mars.
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