Gas Giant Planet HD 209458b (IMAGE)

NASA/Goddard Space Flight Center

Gas Giant Planet HD 209458b

Caption

This is an artistic illustration of the gas giant planet HD 209458b in the constellation Pegasus. To the surprise of astronomers, they have found much less water vapor in the hot world's atmosphere than standard planet-formation models predict.

Credit

NASA, ESA, G. Bacon (STScI) and N. Madhusudhan (UC)

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