The European Space Agency's Mars Express spacecraft detected sediments on Mars' northern plains that are reminiscent of an ocean floor, in a region that has also previously been identified as the site of ancient Martian shorelines, the researchers said.
"We interpret these as sedimentary deposits, maybe ice-rich," study leader Jérémie Mouginot, of the Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) in France and the University of California, Irvine, said in a statement. "It is a strong new indication that there was once an ocean here."
As part of its mission, Mars Express uses a radar instrument, called MARSIS, to probe beneath the Martian surface and search for liquid and solid water in the upper portions of the planet's crust. . . .
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