#OnThisDate May 30, 1971: Mariner Milestone

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References / More Knowledge:
NASA. “Mariner 9.” NASA Solar System Exploration, https://solarsystem.nasa.gov/missions/mariner-9/overview/. Accessed May 30, 2025.
NASA History Division. “Mariner Mars 1971 (Mariner 9).” NASA History, https://history.nasa.gov/mariner.html. Accessed May 30, 2025.
Jet Propulsion Laboratory. “Mariner 9 Mission Overview.” JPL, https://www.jpl.nasa.gov/missions/mariner-9. Accessed May 30, 2025.