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LiveScience

Jamie Carter

Longest canyon in the solar system reveals new secrets — Space photo of the week

Mars NASA Solar System Earth ESA

Mars' Valles Marineris stretches nearly a quarter of the way around the planet's equator. (Image credit: NASA/JPL-Caltech/University of Arizona)

QUICK FACTS

What it is: Candor Chasma, a large canyon on Mars

Where it is: Valles Marineris, the biggest canyon network in the solar system

When it was shared: Aug. 14, 2025

Mars has a huge network of canyons that stretches about 2,500 miles (4,000 kilometers) across its equator. This canyon system, called Valles Marineris, is the largest in the solar system, dwarfing Earth's largest canyon, which covers 460 miles (750 km) under Greenland's ice sheet. (Condolences to the Grand Canyon and its mere 277-mile length.)

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