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
是不断变动，不过通常约是1000K，使得氢原子平均速为
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.
地球外气层底是不断变动，不过通常约是1000K，使得氢原子平均速为秒5公里。
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