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“冰冻星球”冥王星的热量从何而来?

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“冰冻星球”冥王星的热量从何而来? JPEG Origin Image Download
冥王星的表面异常寒冷,温度可低至零下200多摄氏度,但分布在其表面的冰川、山脉和冰火山足以证明这颗星球上有受热量驱动的地质活动,那么这种热量是如何形成的呢?