What happened in the 1970s?
๐ถโโ๏ธ Space Exploration: Mars 3 lands and transmits from Mars (1971)
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Further Reading
Mars 3 Orbiter Information - NASA - NSSDCA - Spacecraft - Details (nasa.gov)
Could This Be the Mars Soviet 3 Lander? - Jet Propulsion Laboratory (nasa.gov)
The Soviet Mars Shot That Almost Everyone Forgot - RFE/RL (rferl.org)
50 years ago, a forgotten mission landed on Mars (astronomy.com)
The First Rover on Mars - The Soviets Did It in 1971 (planetary.org)
Mars program - Wikipedia (wikipedia.org)
2 December 1971 - Mars 3 Sends First Image Of Mars Surface Back ... (apesinspace.co)