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            新概念英語聽力mp3下載第三冊lesson 55

            Source: 恒星英語學習網  Onion  2007-03-21  我要投稿   論壇   Favorite  

             Radio astronomy has greatly increased
            our understanding of the universe. Radio
            telescopes have one big advantage over
            conventional telescopes in that they can
            operate in all weather conditions and can
            pick up signals coming from very distant
            stars. These signals are produced by
            colliding stars or nuclear reactions in
            outer space. The most powerful signals
            that have been received have been emitted
            by what seem to be truly colossal stars
            which scientists have named 'quasars'.
            A better understanding of these pheno-
            mena may completely alter our concep-
            tion of the nature of the universe. The
            radio telescope at Jodrell Bank in
            England was for many years the largest in the world. A new telescope, over
            twice the size, was recently built at Sugar Grove in West Virginia.
            Astronomers no longer regard as fanciful the idea that they may one day
            pick up signals which have been sent by intelligent beings on other worlds.
            This possibility gives rise to interesting speculations. Highly advanced civiliza-
            tions may have existed on other planets long before intelligent f.mp3s of life
            evolved on the earth. Conversely, intelligent being which are just beginning to
            develop on remote worlds may be ready to pick up our signals in thousands of
            years' time, or when life on earth has become extinct. Such speculations no
            longer belong to the realm of science fiction, for astronomers are now exploring
            the chances of communicating with living creatures (if they exist) on distant
            planets. This undertaking which has been named Project Ozma was begun in
            1960, but it may take a great many years before results are obtained.
            Aware of the fact that it would be impossible to wait thousands or millions of
            years to receive an answer from a distant planet, scientists engaged in Project
            Ozma are concentrating their attention on stars which are relatively close. One
            of the most likely stars is Tau Ceti which is eleven light years away. If signals
            from the earth were received by intelligent creatures on a planet circling this
            star, we would have to wait twenty-two years for an answer. The Green Bank
            telescope in West Virginia has been specially designed to distinguish between
            random signals and signals which might be in code. Even if contact were
            eventually established, astronomers would not be able to rely on language to
            communicate with other beings. They would use mathematics as this is the
            only truly universal language. Numbers have the same value anywhere. For
            this reason, intelligent creatures in any part of the universe would be able to
            understand a simple arithmetical sequence. They would be able to reply to our
            signals using similar methods. The next step would be to try to develop means
            for sending television pictures. A single picture would tell us more than thou-
            sands of words. In an age when anything seems to be possible, it would be
            narrow-minded in the extreme to ridicule these attempts to find out if there is
            life in other parts of the universe.
             

             


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