Martian Meteor Collision May Have Triggered a 1,000-Foot Tsunami

Three and a half billion years ago, a blood-red wall of water as tall as a skyscraper may have hurtled across the surface of Mars, inundating an area of land larger than the United States.

Two separate groups of astronomers first put forth the controversial theory in 2016. Their idea was based on "fingerprints" of massive wave action left behind on the Martian landscape — the huge fields of boulders carved with rivulets, potentially left behind as the waves retreated back over the landscape.

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