Curious Minute answer

What is the name of the enormous canyon system that stretches roughly 2,400 miles across Mars?

The answer

Valles Marineris

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Why it's right

Valles Marineris is a huge system of canyons on Mars, stretching about 2,400 miles. It is far longer and deeper than Earth's Grand Canyon. Images from spacecraft reveal its steep walls and vast connected valleys.

NASA Science: valles marineris the grand canyon of mars

Did you know?

Valles Marineris is named for Mariner 9, the spacecraft that photographed the canyon system in 1971.

NASA Science: mariner 9

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Sources: NASA, NASA