Photo: Half-Hot, Half-Cold Planets Have Supersonic Jet Streams

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The gas giant HD 149026b (seen above in an artist's rendering) is the hottest planet observed so far in the universe.

Another Jupiter-like planet, HD189733b, has heat-carrying, supersonic jet streams that reach speeds of 7,000 miles (11,265 kilometers) per hour, an October 2008 study suggests.

Illustration courtesy NASA/JPL-Caltech/T. Pyle (SSC)

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