04/09/2026
🔥 Saturn may be the only planet we know with giant geometric weather patterns at both poles.
Hubble observations have revealed a massive 10-sided atmospheric wave—a decagon—around Saturn’s south pole, while its famous north-polar hexagon has been known for more than four decades.
This isn’t a solid structure or a shape drawn onto Saturn’s clouds. The decagon is a gigantic wave embedded within a powerful jet stream, centered around 63° south latitude. Observations at different wavelengths suggest that the pattern extends through multiple atmospheric layers, giving it genuine vertical structure.
And the scale is incredible: one side can stretch more than 16,700 km—wider than Earth. Unlike the remarkably stable northern hexagon, the southern decagon appears more dynamic and slowly drifts eastward at roughly 10 km/h.
Hints of the structure appeared in Hubble observations from 2023, with the shape becoming clearer in later observations. Scientists may now be watching a giant planetary weather pattern evolve in real time.
Why Saturn creates such enormous geometric atmospheric waves remains an open mystery. With a long-lived hexagon in the north and an evolving decagon in the south, Saturn has given scientists two extraordinary natural laboratories for understanding planetary weather.
The strangest part? Saturn isn’t just stormy—it seems to make geometry out of its storms. 🪐
Source: NASA/ESA Hubble Space Telescope, STScI, Science Advances
