Tsunamis on Mars. Ice Craters on Ceres. Boulders on Comet 67P. @drfunkyspoon David Grinspoon, author, "Earth in Human Hands."



(Photo: 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.

Today, Mars is dry and very cold, and any impact would merely dig out a dusty hole.

But researchers have long speculated that the low, flat terrain in Mars' northern hemisphere could have hosted an ocean if the climate conditions were just right.

The nagging doubt with this theory has been the absence of an identifiable shoreline - something the new study could now help explain. http://www.bbc.com/news/science-environment-36333760)




Twitter: @batchelorshow

Tsunamis on Mars. Ice Craters on Ceres. Boulders on Comet 67P. @drfunkyspoon David Grinspoon, author, "Earth in Human Hands."

"...The scientists theorize that an asteroid smashed into the planet 3 billion years ago, creating the Lomonosov crater and triggering the tsunami. Researchers point to "thumbprint terrain"—so named because it resembles ridges on a human thumb—on the planet's parched surface whose geological formations suggest massive water movement, reports the Christian Science Monitor.

"It was a really large-scale, high speed tsunami," says French researcher Francois Gostard. The initial wave from the impact would have been nearly 1,000 feet high, with waves about 300 feet high crashing ashore hours later.

Previous research has suggested that mud flows or glacier movements are responsible for the thumbprint, but "it's very hard to conceive of any other process other than a tsunami" that could have etched out these precise formations, says Costard...."


Apr 01, 05:56 AM
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