Geoboffins spot hundreds of ghost dunes on Mars | 7/12/2018 | Staff
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Mars was once covered in hundreds of giant dunes as big as the US Capitol Building billions of years ago, according to new research.

A pair of scientists from the University of Washington have discovered more than 300 crescent-shaped structures wedged into the eastern side of Hellas Planitia, an impact crater measuring over 2,700 kilometers (1,678 miles).

Satellite - Images - Pits - Dunes - Liquid

They studied satellite images and found pits also known as “ghost dunes”. Flowing liquid or lava partially swamped the dunes, where they hardened over time. Winds wore away the exposed tips and emptied them from the inside out, leaving the empty husks behind.

“They are all going the same way, which you would expect for dunes because they are all...
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