Billions of years ago Mars was a very different planet.
With giant oceans coating the red planet's northern hemisphere, huge meteoroids would slam into the planet's surface kicking up giant waves 120 metres high.
At least that's what scientists at the Planetary Institute in Tucson, Arizona are proposing in a new paper.
That's higher than the Statue of Liberty and comfortably dwarfs anything we've ever seen on Earth.
These world-ending tsunamis would have taken place every 3 million years or so, re-shaping Mars' landscape and crushing its shoreline under the enormous body of water.
Mars researcher at the Planetary Science Institute in Tucson Alexis Rodriguez exclaims: “It would have been pretty spectacular.”
This isn't the first time the idea of huge tidal waves has come up in relation to Mars.
Scientists have been proposing the theory as early as 2010 when it was calculated that high-energy waves could have left a lasting imprint on the Martian shoreline, one that we can still see today.
These tsunamis won't have been like anything on Earth - for starters they will have been created on a frozen ocean.
That means that instead of a pure liquid wave it would have been more of an icy slurry. It's also suggested that the wave may not have even washed back - freezing into huge ice boulders.
James Dohm, a planetary scientist at the University Museum of the University of Tokyo points out that even as the oceans on Mars eventually froze and died out the huge boulders deposited by the tsunami will have remained untouched by billions of years of erosion.
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