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Whose observations of Mars helped reveal that the planet has giant volcanoes and a canyon system larger than anything on Earth?
Quick Answer
NASA's Mariner 9 made those observations in 1971. It was the first spacecraft to orbit Mars and returned the first close-up global view of the planet.
The Full Story
Mariner 9 entered Mars orbit in 1971 and mapped the planet in unprecedented detail. Its images revealed giant volcanoes such as Olympus Mons and the enormous canyon system now called Valles Marineris. Before Mariner 9, Mars was much less understood and often obscured by dust. The mission changed Mars from a distant dot into a complex geological world.
Key Facts
1.Mariner 9 orbited Mars in 1971
2.It revealed Olympus Mons and Valles Marineris
3.It was the first spacecraft to orbit Mars
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"Mars hid monster volcanoes and canyons until a spacecraft finally mapped it."
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