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发布时间：2006-06-23 21:00     点击：

　　Our space and time laws don't seem to apply to objects in the area of a black hole.Einstein's relativity theory is the only one that can explain such phenomena．Einstein claimed that matter

　　and energy are interchangeable．so that there is no"absolute"time and space. There are no constants at all, and measurements  of time and space depend on the position of the observer-they are relative．Einstein's theory provided a basis for the idea of black holes before astronomers started to find some evidence for their existence．It is only recently that astronomers have begun

　　specific research into black holes．

　　The most convincing evidence of black holes comes from research into binary(由两部分组成的) star systems．In some binary star systems，astronomers have shown that there is an

　　invisible companion star,a"partner"to the one which we can see in the sky．There is one star,called by its catalogue number HDE 226868．which must have a partner．This partner star,it seems．has a mass ten or twenty times greater than the sun-yet we can't see it．Matter from HDE 226868 is being dragged towards this companion star．Could this invisible star,which exerts such a great force，be a black hole?Astronomers have evidence of a few other stars too，which might have black holes as companions．

　　4l Which of the following does NOT fit the definition of the black hole?

　　A The black hole is a region of space．

　　B The black hole sucks in any object that passes by it．

　　C  The black hole is visible through an infrared telescope．

　　D  The black hole has no matter．

　　42 Why does the author put"neutron star"in quotation marks?

　　A  It is a special term of astronomy．

　　B  It is an inventedterm．

　　C  He is quoting an authority．

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