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Temperatures of the Planets in the Solar System Mercury is the closest planet to the Sun, but it is not the hottest. That title is held by Venus. Its dense carbon dioxide atmosphere creates a powerful greenhouse effect, heating the surface to about 460°C. Earth, in turn, is one of the few planets with a temperature suitable for life: an average of 15°C. At the other end of the scale is Neptune, where the temperature can drop to -214°C. This makes it one of the coldest objects in our system. Temp