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.
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每秒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.
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每秒5公里。
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