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由于其低密度、高速自转和流体的可变性,土星的外形呈现为一个椭球体,也就是极轴相对扁平而赤道相对突出,它的赤道直径和两极直径之比相差大约10%(前者千米,后者千米)。

其它气体行星虽然也是椭球体,但突出程度都较小。虽然土星核心的密度远高于水,但由于存在较厚的大气层,土星仍是太阳系中仅有的密度低于水的行星,它的比重是0.69g/cm3。

土星的质量是地球的95倍,相较之下木星质量是地球的318倍,但木星的直径大约仅为土星的1.21倍。

木星和土星一起占据太阳系总行星质量的92%。

内部构造

土星被称为气态行星,但它并不完全是气态的。这颗行星主要包括氢气,在密度为0.01g/cm3以上时氢气变成了非理想液体。此密度被达到在包含99.9%土星质量的半径。

从行星内部直到的核心的温度,压力和密度全都是稳步上升,使在行星的更深层导致氢气转变成金属。

虽然只有少量的直接资料,但标准的行星模型表明,土星的内部结构仍被认为与木星相似,即有一个被氢和氦包围着的较小核心。岩石核心的构成与地球相似但密度更高,估计核心的质量大约是地球质量的9–22倍。

在核心之外,有更厚的液态金属氢层,然后是数层的液态氢和氦层,在最外层是厚达1000千米的大气层,也存在着各种型态冰的踪迹。

土星有非常热的内部,核心的温度高达°C,并且辐射至太空中的能量是它接受来自太阳的能量的2.5倍。大部分能量是由缓慢的重力压缩(克赫历程)产生,但这还不能充分解释土星的热能制造过程。额外的热能可能由另一种机制产生:在土星内部深处,液态氦的液滴如雨般穿过较轻的氢,在此过程中不断地通过摩擦而产生热。

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