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'Ice hovercraft' tracks seen on Mars
Long thin grooves - called gullies - on the surface of Mars may have been made not by water but by blocks of frozen carbon dioxide - dry ice.
These blocks seem to have flowed down Martian sand dunes on cushions of carbon dioxide gas.
Researchers liken these icy sleds to small hovercraft "ploughing furrows as they go".
The findings, published in the journal Icarus, were discovered on images from Nasa's Mars Reconnaissance Orbiter.
http://www.bbc.co.uk/news/science-environment-22869184
Icarus link here : http://www.sciencedirect.com/science/article/pii/S0019103513001668
