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Scientists are investigating a mysterious giant scar on Mars, known as Aganippe Fossa, which stretches 600km across the lower flank of the volcano Arsia Mons. Captured by the ESA’s Mars Express, this feature is longer than the Grand Canyon. First spotted in 1930, it is now being observed up close for the first time. The ESA describes it as a dark, uneven scar with steep walls, located in the Tharsis region, home to several massive volcanoes, including Olympus Mons, the tallest in the solar system.

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