如果一架宇宙飞船飞行超过每秒11公里，它就能摆脱地球引力。
If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.
你知道宇航员是怎样乘宇宙飞船飞行的吗？
一个巨大的金属网将用于捕获磁性离子，并用于推动飞船飞行。
A large metallic mesh ACTS as a net to catch these particles and have them push a spacecraft along.
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