Image of a sand dune known as the Bagnold dunes, located on the Gale crater on Mars, captured by the Curiosity rover.

Bagnold dunes are a 35 km long dark gray mud / sand dune in the Gail Crater on Mars.

They are named after Ralph Alger Bagnold, one of the first explorers to explore the physics behind the sand dunes across the Libyan desert.

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