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
温度是不断变动，不过通常约是1000K，使得氢原子
速度为
秒5公里。
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.
地球外气层底温度是不断变动，不过通常约是1000K，使得氢原子速度为秒5公里。
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