which were once thought to be petrified sand dunes or remnants of ancient Martian glaciers, as Live Science notes. However, ...
A NASA satellite has spotted frozen "kidney beans" on Mars' sand dunes trapped in place until springtime. Photographing them ...
The frost stops wind from scooping up sand, preventing the dunes ... Related: Hundreds of black 'spiders' spotted in mysterious 'Inca City' on Mars in new satellite photos The amount of carbon ...