Saturn's hexagon

Best explanations yet for the strange, gigantic, permanent, rotating, hexagonal cloud formation at Saturn's north pole [more or less pilfered from various comments on slashdot]:

- The US Government's super-secret replacement facility for the Pentagon

- Giant Magrathean hex bolt that holds the planet together

- Spinning bucket of water experiment on a planetary scale

- After those incredible rings, God got lazy with polygon rendering for the rest of the planet

- Honeycomb built by giant Space Bees

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