Photo: Racetrack Playa sliding rocks unexplained: NASA still struggling
Rocks are sliding mysteriously across Racetrack Playa leaving stunning parallel trails. Credit:NASA
Racetrack desert area is almost perfectly flat i.e. Playa means a lake bed overwhelmed by drought all time. So, if you cast a look over the mysterious area you can see for kilometers and no obstacle obstructs your view.
What is so special with this desert? Well, the people are puzzled because the stones seem to slide by themselves without any help from a propulsion source of an eventual slope of the terrain.
Interestingly, some rocks perform their trip in pairs, drawing nearly parallel tracks that resemble those left by a car or a railway.
Speed of displacement??? Well, according to some studies, part of the stones appear to move as fast as a person pace.
Here an example of rock that left a trail in the clay after it traveled across the flat desert. Credit: NASA/GSFC/Cynthia Cheung
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Size, weight??? The rocks weigh between 1-700 pounds (with 25-30 pounds most of them) and feature sizes of up to 30 cm.
Witnesses? Nope! Nobody ever saw a rock moving!
Previous ideas, explanations? Yes, but all of them turned out to be unreliable. Experts suspected animals (pushing stones in the desert?), gravity, quakes, etc, but all these ended on a dead track. Of course, there is only room for imaginations, speculations, SF stories.
This phenomenon was subject of dozens scientific debates over years but it seems that no viable explanation came up so far. So, in case you have a plausible idea just step forward and probably NASA and whole scientific community will be happy.
You can find out more about the mystery of sliding stones from Racetrak Playa at Geology.com.