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NASA's Cassini spacecraft circled Saturn for 13 years and never saw a shape at the south pole, but when the planet's slow seasons tilted that pole back toward Earth, a giant ten-sided figure was waiti

A perfect ten-sided storm has materialized at Saturn's south pole—and it vanished the moment scientists stopped looking. Saturn has been keeping a secret at its bottom, and it took the planet’s own calendar to give it away. This week, NASA and an international team announced that Hubble has confirmed a decagon — a giant, regular, ten-sided atmospheric wave — wrapped ar... [4160 chars]

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