天文学家们已在广阔的太空中探寻了50年，希望能接收到一些来自其他星球的无线电波简讯。
FOR five decades astronomers have searched the vast ocean of space in the hope of picking up some kind of radio message from the neighbours.
值得注意的是，我们的星球开始接收到无线电噪音是在大约100年前当我们开始传播无线电波和电视信号的时候。
It's also worth remembering that our planet started to get "radio noisy" when we started transmitting radio and television signals about 100 years ago.
卫星通过无线电波把它们所拍的其他星球的照片送回地球。
Satellites sent back the photographs of other planets to earth by way of radio.
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