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why neptune is called as the coldest planet

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Neptune
Neptune  
Hi,
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Why is Neptune the coldest planet? Neptune is the farthest planet from the Sun so does not get as much radiation as others. It is therefore the coldest. The average temperature there is about -200C.  Pluto at an average of -229C is colder but is not considered a planet anymore.
RRG
http://www.universetoday.com/21669/temperature-of-neptune/
http://www.universetoday.com/13893/temperature-of-pluto/
http://news.nationalgeographic.com/news/2006/08/060824-pluto-planet.html

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