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
层底的温度是不断变动的，不过通常约是1000K，使得氢
子平
的速度为每秒5公里。
子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.
地层底的温度是不断变动的，不过通常约是1000K，使得氢子平的速度为每秒5公里。
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