These 300kg Stones Have Been Moving On Their Own In This Valley For Years, And Scientists Have Finally Explained How

Key Points:

• Scientists have finally observed the movement of the famous sailing stones at Racetrack Playa in Death Valley after more than seventy years of mystery, using motion-activated GPS and a weather station to capture real-time data.
• The stones, some weighing over 300 kilograms, move very slowly—at 2 to 6 meters per minute—and only under rare conditions when the playa is flooded and thin ice sheets form on the surface.
• Research revealed that thin ice sheets, just 3 to 5 millimeters thick, break into floating panels pushed by light winds of 3 to 5 meters per second, which transfer force to the stones and move them across the soft mud.
• Movement events are short and irregular, lasting from a few seconds up to 16 minutes, and can involve hundreds of stones moving simultaneously over distances exceeding 60 meters.
• The study highlights how the combination of rare weather conditions and the slow pace of movement made direct observation difficult, explaining why the phenomenon remained a mystery for so long.