Because the moon's body blocks direct radio communication with a probe, China first had to put a satellite in orbit above the moon in a spot where it could send signals to the spacecraft and to Earth.

由于月球阻碍了与探测器的直接无线电通信，中国首先必须把一颗人造卫星送入月球轨道上的一个点，人造卫星可以从那里向航天器和地球发射信号。

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"Smile Beijing" was sent into space by China's first lunar probe satellite Chang 'e-i, which sent back a signal of the song on December 4, 2007.

月球探测卫星“嫦娥一号”曾搭载《微笑北京》，并于07年12月4日从太空传回这首歌曲。

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A fast design method for transfer orbit of lunar probe is presented using overlap conic curve method aimed at lunar landing transfer orbit and lunar satellite transfer orbit.

利用重叠圆锥曲线方法，针对着陆型和月球卫星型两种地月转移轨道，给出了一种地月转移轨道的快速设计方法。

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The FAA plans to have a system whereby each aircraft in free flight has a satellite-linked probe that tells the pilot if another aircraft is within 20 miles.

ECONOMIST: Clearing the skies | The

In February, the Wilkinson Microwave Anisotropy Probe (Wmap) satellite took the most detailed picture yet of the cosmic microwave background - an image of the infant cosmos when it was less than 400, 000 years old.

BBC: NEWS | Science/Nature | Dark energy tops science class

The cost of the Mars Global Surveyor probe was roughly 200 million USD for the satellite and launch, plus 20 million per year.

FORBES: Insane Calculation: It Costs More To Send A Text Next Door Than To Mars