The Sailing Stones of Death Valley: A Century-Old Mystery That Melted Away
In a remote corner of Death Valley National Park in California lies Racetrack Playa, a dry lakebed almost five kilometres long and as flat as nearly any surface in nature. Scattered across it sit hundreds of rocks, some weighing up to about 320 kilograms, and behind many of them stretch long furrows carved into the mud: trails that run for tens or hundreds of metres, curving, zigzagging, sometimes turning in parallel like ships in formation. The rocks had clearly moved. Yet in nearly a century of records, no one had ever seen one do it.
Scientific attention began in 1948, when two geologists mapped the trails and proposed dust devils. Later researchers blamed hurricane-force winds, slick films of algae, or thick sheets of ice carrying the rocks like rafts. Others suspected pranksters, though the absence of footprints argued against a hoax. One study even tested for magnetic effects and found none. Every theory failed the same test: nobody could catch the playa in the act.
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