"If you think about free-floating planets, there's no nearby star that can produce heat and energy... but even in our solar system, there are [externally frigid worlds] that have hot cores," he said.

“如果你琢磨不受约束自由漫游的行星，想到它附近没有能够提供热量和能量的恒星……但即便在我们太阳系，都会有炙热的核心，更不用说那些寒冷的地方。”他说。

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