On This Day In Space: Nov. 13, 1971: Mariner 9 becomes the 1st spacecraft to orbit Mars

On Nov. 13, 1971, Mariner 9 became the first spacecraft to orbit Mars. See how it happened in our On This Day In Space series.

On This Day In Space: Nov. 13, 1971: Mariner 9 becomes the 1st spacecraft to orbit Mars
On Nov. 13, 1971, Mariner 9 became the first spacecraft to orbit Mars. See how it happened in our On This Day In Space series.