Mariner 9 successfully entered Mars orbit #OTD in 1971, beating the Soviet Mars 2 spacecraft which had an 11-day head start, to become the first spacecraft to orbit another planet! Taking over 7,000 pictures, Mariner 9 mapped 85% of Mars's surface. More: https://go.nasa.gov/3zZ4zTe #NASAhistory http://nitter.net/NASAhistory/status/1591838316030087173#m
In Depth | Mariner 09 – NASA Solar System Exploration
NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.NASA Solar System Exploration