密度
最も平均密度の高い惑星 地球 5.515g/cm3
最も平均密度の低い惑星 土星 0.69g/cm3
A resulting density of 1.27 g/cm3 makes Uranus the second least dense planet, after Saturn.
有趣。
土星特質強的人通常會被形容為重的，實際上，土星卻是太陽系當中密度最小的行星。
Uranus's internal heat appears markedly lower than that of the other giant planets; in astronomical terms, it has a low thermal flux.[18][61]Why Uranus's internal temperature is so low is still not understood. Neptune, which is Uranus's near twin in size and composition, radiates 2.61 times as much energy into space as it receives from the Sun.[18] Uranus, by contrast, radiates hardly any excess heat at all. The total power radiated by Uranus in the far infrared (i.e. heat) part of the spectrum is 1.06 ± 0.08 times the solar energy absorbed in itsatmosphere.[12][62] In fact, Uranus's heat flux is only 0.042 ± 0.047 W/m2, which is lower than the internal heat flux of Earth of about 0.075 W/m2.[62] The lowest temperature recorded in Uranus's tropopause is 49 K (–224 °C), making Uranus the coldest planet in the Solar System.
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