美国正在进行通过激光进行卫星对卫星通信的试验，它可以携带更多的数据，并且与无线电波相比不大容易受到干扰。

America is experimenting with satellite-to-satellite communication by laser, which can carry more data and is less prone to interference than radio waves.

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美国宇航局的纳米卫星教育发射计划为教育团体和科学任务提供免费发射卫星的机会，其现在也对非营利性公司开放。

The NASA Educational Launch of Nano Satellite program, which offers free launches for educational groups and science missions, is now open to nonprofit corporations as well.

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随着时间的推移，卫星失去了推进速度，使得地球对卫星的拉力大于把卫星推离地球的力。

As time goes by, the satellite loses its speed, which makes the force pulling it towards the earth stronger than the force pulling it away.

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