This is the first-ever map of the surface of 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 by Spitzer. Hotter temperatures are represented in brighter colors.
The map tells astronomers that temperatures on HD 189733b are fairly even all around. While the dark side is about 650 degrees Celsius (about 1,200 degrees Fahrenheit), the sunlit side is just a bit hotter at 930 degrees Celsius (1,700 degrees Fahrenheit).
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