国际电信联盟保留了1400 - 1427 MHz范围内的特殊无线电频段，亦称L -频段，特别供地球探测卫星和太空天文使用。

The International Telecommunications Union reserves a special radio band in the 1400-1427 MHz range, called the L-band, especially for Earth-observing satellites and space astronomy.

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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。

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.

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这两枚欧洲宇航局建造的卫星将探测太阳和地球之间如何进行相互作用。

The satellites, built by the European Space Agency (ESA), will look at interaction between the sun and the Earth.

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