NASA's Mariner 9 became the first spacecraft to orbit Mars on November 13, 1971, a milestone that marked a new stage in the exploration of the Red Planet. Until then, spacecraft had only flown past Mars or landed on it, so placing a probe into orbit around the planet was a first in spaceflight history.
From its orbit, Mariner 9 sent back close-up views of the Martian surface, giving scientists a far more detailed picture of the planet than earlier flyby missions had provided. The images revealed terrain that researchers had not been able to study in such detail before, and the mission became a key step in understanding Mars as a world in its own right.
The achievement is recalled as part of a series of anniversary features marking notable moments in space exploration. For the space agency and the wider science community, Mariner 9 remains a reference point for later orbiters that have continued to map and study Mars from above.
Credit. Based on reporting by Hanneke Weitering and Elizabeth Howell for Space.com. Is this your work? Write to us.
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