2014年12月四六级晒分活动正在火热进行,N多大礼等你来拿!
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21 Astronomers have spent hundreds of years searching for signs of life on other planets, using telescopes. When they saw the geography of Mars , they thought they could see canals and that this might be evidence of intelligent life on the planet. More recently, however, spacecraft have been sent there to analyze the soil for signs of life. The result were negative and astronomers now feel certain that no life exist on the surface of any craft far beyond our solar system (太阳系)I not realistic because of the huge distances.
Unless life comes and visit us, the only way we likely to know of its existence is from radio message. Listening for intelligent extraterrestrial or E.T. life is not a new idea, but the techniques now being used offer a much better chance off success than before. Looking for evidence of life in other solar systems now means using special radio receivers called radio telescopes to listen out for message. The idea is that intelligent forms of life would have discovered radio waves and would, like us, be using them to communicate.
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