1.One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites.

1.地球外在生命理论是基于陨在碳化合物质这一实。

2.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.

2.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每秒5公里。