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Ancient Floods on Mars - Universe Today
The European Space Agency's Mars Express spacecraft took this image of an ancient outflow channel in the Ares Vallis region of Mars. This immense channel is 1400 km (870 miles) long, and eventually empties into Chryse Planitia; where the Mars Pathfinder mission landed in 1997. The bumpy "islands" are individual blocks of rocks and hills that were harder for the rushing water to weather down, so they remain in the channel.