Saturn’s hexagon: what holds it together?

Rotating-tank experiments made polygons in sheared fluid. A model proposes six planetary waves trapped in the jet could move with it, seeming still. 🔬

Cassini winds fit possible jet instability. Gravity data inspired another idea: smaller cyclones pinch a deep jet upward into a hexagon. 🌀

Later simulations made a polygon with nine edges, not Saturn’s six. No proposal explains how the observed hexagon is maintained; the question remains open. 🌌