The temperature at Earth's exobase oscillates but is typically about 1,000 kelvins, implying that hydrogen atoms have an average speed of five kilometers per second.
地球外气层底的温度是不断变动的,不过通常约是1000K,使得氢原子平均的速度为
5
里。
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Who knows what they made of the heat, but the physicist Lord Kelvin — of temperature fame, naturally — had a theory: Earth started off hot, and has been cooling down ever since, like a baked potato pulled from the oven.
谁也不知道地球的热量是怎么来的,但是以热力学而著名的物理学家 Kelvin 有一个理论:地球最开始是炎热的,然后逐渐冷却了下来,就像一个烤土豆放进烤箱。
Darwin's Theory of Evolution strongly implied the Earth was at least millions of years old, and Lord Kelvin, a hugely respected physicist and engineer, confirmed the Earth was ancient, given that it must have cooled from an initially molten state.
达尔文的进化论强烈暗示地球至少有几百万年的历史,而凯尔文勋爵,一位广受尊敬的物理学家和工程师,也证实了地球是古老的,因为它一定是从最初的熔融状态冷却下来的。