是为了让火箭的速度足够快，足以逃离地球的引力。
It is to get the rocket going fast enough to escape Earth's gravity.
NASA计划以其未来大部分逃离地球的载荷（特别是前往月球和火星的）来运载立方体卫星。
NASA plans for most of its future Earth-escaping payloads (to the moon and Mars especially) to carry Cube Sats.
但这些气体产生后立刻就逃离地球进入太空了。
But that gas escapes from Earth into space shortly after the gas's formation, Shull said.
所以如果想逃离地球，则你需要11。2千米，那里有。
And so if you wanted to escape from the Earth then you need your 11.2 kilometers we have it there.
10年后，的1946年，首枚美国制造的逃离地球大气层的火箭从白沙发射，达到了50英里的高度。
10 years later, in 1946, the first American-built rocket to leave the earth's atmosphere was launched from White Sands, attaining 50 miles of altitude.
许多人相信，答案在于利用太阳能来加速航天器。航天器逃离地球大气层后利用太阳能能进行长程加速，因此可以更快地到达深空。
Many believe the answer lies in using a space sail that harnesses the sun's energy to keep a spacecraft accelerating long after it escapes Earth's atmosphere and reaches deep space.
许多人相信，答案在于利用太阳能来加速航天器。航天器逃离地球大气层后利用太阳能能进行长程加速，因此可以更快地到达深空。
Many believe the answer lies in using a space sail that harnesses the sun's energy to keep a spacecraft accelerating long after it escapes Earth's atmosphere and reaches deep space.
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