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Mariner 9 transformed how humans saw Mars
Key Takeaways
- Mariner 9 became the first human-built spacecraft to orbit Mars on Nov. 13, 1971.
- It arrived during a dust storm but later revealed enormous volcanoes and Valles Marineris.
- The mission changed the prevailing view of Mars as a mostly moon-like cratered world.
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DT Editorial Team··via space.com