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Tsunami once ravaged Mars

Mars was once a lot less peaceful, as new evidence indicates that tsunamis once tore across the formerly watery world, BBC reports. These tsunamis would have occurred before 3 billion years ago, when scientists believe that the Red Planet’s northern hemisphere could have been covered in a large ocean. These tsunamis could help explain a vexing question for scientists studying Mars: If the planet had such a large ocean, where is much of the shoreline? Large tsunamis could have carried sediment onto the land andobscured parts of the martian ocean’s shoreline, according to a study published today in Scientific Reports. Scientists studied sediment patterns through satellite data to delineate two tsunamis, both of which were likely caused by asteroid impacts. Both tsunamis had waves between 50 and 120 meters tall, and flooded up to 1 million square kilometers—roughly the same area affected by the tsunami caused by the dinosaur-killing asteroid that hit Earth 66 million years ago.

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