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Originally posted by Druscilla
reply to post by qmantoo
These tracks are side by side. Sand people always ride in single file to hide their numbers.
edit on 29-7-2013 by Druscilla because: (no reason given)
Originally posted by qmantoo
I want to show you some tracks I found recently. These do not appear to be made by the Rovers as there are no rover tracks in the foreground and on a barren, lifeless planet, there should be no other tracks apart from tracks made by the Earth rovers.
So what made these as I dont think they are made by rocks rolling down the slope?
The left hand tracks have no rock at the bottom so cannot possibly be caused by rolling rocks.
For the right hand track, in my opinion as a non-expert, it is far-fetched but possible that it could be argued this is caused by rocks rolling down the slope.
The link to the NASA original is here so Have a look at this and tell me if these are 2 sets of tracks or could they be made by something else?.
Many areas on Mars experience the passage of dust devils. A thin coating of fine bright dust covers most of the Martian surface. When a dust devil goes by it blows away the coating and exposes the underlying dark surface, which within a few weeks assumes its former bright colour, either from being re-covered through wind action or some form of oxidation through exposure to sunlight and air. Dust devils occur when the sun warms up the air near a flat, dry surface. The warm air then rises quickly through the cooler air and begins spinning while moving ahead. This spinning, moving cell may pick up dust and sand and leave behind a clean surface.
Dust particles become electrified in dust devils when they rub against each other as they are carried by the winds, transferring positive and negative electric charge in the same way you build up static electricity if you shuffle across a carpet. Scientists thought there would not be a high-voltage, large-scale electric field in dust devils because negatively charged particles would be evenly mixed with positively charged particles, so the overall electric charge in the dust devil would be in balance.
However, the team's observations indicate that smaller particles become negatively charged, while larger particles become positively charged. Dust devil winds carry the small, negatively charged particles high into the air, while the heavier, positively charged particles remain near the base of the dust devil. This separation of charges produces the large-scale electric field, like the positive and negative terminals on a battery. Since the electrified particles are in motion, and a magnetic field is just the result of moving electric charges, the dust devil generates a magnetic field also.