Quick, what is causing these tracks on Mars?
Would you believe dry ice? That's what planetary scientists think is causing these intriguing marks on the Red Planet. Sand dunes here on Earth became test beds to send blocks of dry ice down gully slopes which in turn created similar looking marks.
Of course the dry ice would eventually sublimate away and leave no traces behind. Read More About It: http://uanews.org/story/marks-on-martian-dunes-may-reveal-tracks-of-dry-ice-sleds and http://science.nasa.gov/science-news/science-at-nasa/2013/11jun_snowboards/
Sky Guy in VA