Nobody knows whether or not there is animal life on the planet Mars; nobody knows whether or not it is possible to reach Mars with a radio signal. In 1924 a group of radio engineers trying to tune in Mars heard signals which they claimed they could not identify with an Earthly source. Last week, with Mars closer to the Earth than at any time since 1924, another group of radio engineers tried a more daring experiment: sending a signal Marsward in the hope that it would be reflected back, picked up again on Earth. They thought they might succeed if:...
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