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Worlds without end: Using the Hubble Space Telescope astronomers have measured the daily rotation of a super Jupiter exoplanet 170 light years away.
They estimate, based upon brightness variations attributed to clouds in the upper atmosphere, that the rotation rate is about 10 hours long. We should all recognize however the significant uncertainty of this number. Clouds change, as do weather conditions. The data only gives us a hint at what is going on here.