Mapping mars

Mariner 9 was the first spacecraft to orbit another planet, successfully mapping Mars and taking over 7000 photos. This mission revealed the planet's complex geography, including a canyon that stretched for thousands of miles Valles Marineris and a huge volcano Olympus Mons reaching 15 miles above base level.
 (NASA) United States 1971 Mapping mars

Mariner 9 was the first spacecraft to orbit another planet, successfully mapping Mars and taking over 7000 photos. This mission revealed the planet's complex geography, including a canyon that stretched for thousands of miles Valles Marineris and a huge volcano Olympus Mons reaching 15 miles above base level.