Beschreibung : Mariner 9 arrived at Mars on 14 November 1971 after a 167 day flight. A 15 minute 23 second rocket burn put the spacecraft into Mars orbit, making Mariner 9 the first spacecraft to orbit another planet.
The Mariner 9 mission resulted in a global mapping of the surface of Mars, including the first detailed views of the martian volcanoes, Valles Marineris, the polar caps, and the satellites Phobos and Deimos. It also provided information on global dust storms, the triaxial figure of Mars, and the rugged gravity field as well as evidence for surface aeolian activity.
Kennedy Space Center post stamp and Mariner 9.

USA 541 - image retouchée ?

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MARINER 9 (MARTIAN ORBITER) · ATLAS SLV3C · 1ST TO ORBIT ANOTHER PLANET