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Scientists think they see evidence of two huge tsunamis having once swept across the surface of Mars.
They point to satellite data suggesting a major redistribution of sediments over a large region at the edge of the Red Planet's northern lowlands.
The US-led team argues that asteroid or comet strikes into an ocean of water could have triggered the giant waves.
Such events could only have occurred more than three billion years ago when the planet was wetter and warmer.