How did scientists finally solve the mystery of Death Valley’s sailing stones?

Thin floating ice, shallow water, sunlight, and light wind can push rocks slowly across wet playa mud.

The rocks move only when rare conditions line up: shallow water freezes into a thin sheet, morning sun breaks it into floating panels, and light winds push those panels against the stones across wet mud. Researchers caught the process directly after tracking more than 60 rocks during December 2013. Their 2014 PLOS ONE paper measured ice only a few millimeters thick and winds around 7–10 mph—far gentler than older theories assumed.

The mystery lasted so long because the event is slow, quiet, and rare.

Why the mystery survived for so long

Nobody saw the stones move because the right conditions are rare, brief, and easy to miss: a cold night, shallow water, morning sun, and a gentle wind, all together on a remote lake bed. The tracks were obvious. The gentle push behind them was almost invisible.

What to do, step by step

1. Picture the sequence: water pools, freezes thin, then breaks into floating panels.
2. Note how little force is needed once wet mud turns slick under a stone.
3. Compare that with older ideas involving strong winds, dust devils, or animals.
4. Look for long, paired tracks in photos — the signature the ice panels leave.
5. If you visit, admire from a distance and leave every stone exactly in place.