Alien Globe: This image shows the first-ever map of the surface of
an exoplanet, or a planet beyond our solar system. The map, which
shows temperature variations across the cloudy tops of a gas giant
called HD 189733b, is made up of infrared data taken the Spitzer.
Hotter temperatures are represented in brighter colors.
Image: NASA/JPL-Caltech/Harvard-Smithsonian CfA
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