NASA's Hubble Finds a True Blue Planet

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Hubble has identified the true visible-light color of a giant Jupiter-sized planet located 63 light-years away. The planet has a cobalt blue color. It has torrential 4,500-mile-per-hour winds that are so hot they melt silicates into raindrops of molten glass. And that's where the cobalt-blue hue comes from, not oceans. The glass droplets scatter blue light more readily than green or red light.

via HubbleSite NewsCenter -- Latest News Releases

http://hubblesite.org/newscenter/archive/releases/2013/26/