Atomic oxygen in a low earth orbit is very active in chemical reactions, and it can oxidate copper. 低地球轨道的原子氧化学性能非常活泼，能使金属铜氧化。
The engine burns again for about 5 minutes to boost the astronauts out of their low earth orbit and on the way of the moon. 引擎再度燃烧大约五分钟，将宇航员从低地球轨道推送到前往月球的路上去。
