Hubble Detects New Decagonal Wave at Saturn’s South Pole

NASA’s Hubble Space Telescope has identified a 10‑sided atmospheric wave encircling Saturn’s south pole, a feature never seen before in the planet’s southern hemisphere. The decagon, first hinted in ground‑based images in 2024 and 2025, appears to be strengthening and extends through multiple layers of the planet’s atmosphere, indicating a vertically‑extended jet. Hubble’s long‑term Outer Planet Atmospheres Legacy program provided images from 2023 onward, confirming the structure’s presence and allowing scientists to track its evolution. Researchers plan to continue observations with Hubble and the James Webb Space Telescope, and to run computer models to determine the decagon’s lifespan and its relation to Saturn’s northern hexagon.