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Which planet has the largest canyon system in the Solar System?
SpaceGeology
Quick Answer
Mars has the largest canyon system, Valles Marineris, stretching about 4,000 km across. In places, it is up to around 7 km deep.
The Full Story
Valles Marineris is the greatest canyon system known in the Solar System. It runs for roughly 4,000 kilometres, making it far larger than Earth's Grand Canyon. The canyon is a vast system of connected troughs, faults, and collapsed regions on Mars. Scientists think tectonic stretching and volcanic activity contributed to its formation.
Key Facts
1.Length: about 4,000 km
2.Depth: up to about 7 km
3.Located on Mars
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"Mars has a canyon so vast you could line up the entire United States inside it."