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Full Explanation of saturn decagon south pole

Astronomers discovered a massive, 10-sided atmospheric cloud pattern—a decagon—encircling Saturn’s south pole. Captured by NASA’s Hubble Space Telescope under the Outer Planet Atmospheres Legacy (OPAL) program, the feature expands our understanding of fluid dynamics on gas giants.

Key Details & Scale

• Scale: The decagon structure spans roughly 104,250 miles (167,820 km) in width, with each of its 10 individual sides extending approximately 10,425 miles (16,782 km)—wider than the diameter of Earth.
  
  
• Location: Embedded within a powerful jet stream positioned around 63° South latitude.
  
  
• Formation: Observations indicate the pattern began forming between 2023 and 2025 as Saturn's seasonal geometry allowed direct viewing of its southern hemisphere from Earth.
  
  

How It Differs from the Northern Hexagon

While Saturn is famous for the steady, six-sided hexagon at its north pole, the newly observed south polar decagon displays key differences:

• Evolution: Unlike the static northern hexagon, the decagon exhibits variations in shade across its boundaries, suggesting it is an active, evolving wave.
  
  
• Atmospheric Drivers: Computer simulations by lead researchers (including Agustín Sánchez-Lavega and teams from NASA Goddard and UC Berkeley) suggest the decagon formed due to a meandering atmospheric wave trapped by a curving jet stream, possibly triggered by an adjacent anticyclonic vortex.
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