Themostimportantscientifictoolsforastronomersaretelesco...

问题详情：

The most important scientific tools for astronomers are telescopes. This is proven by the fact 61.________ the first major discoveries about the solar system, those of Galileo, accompanied the invention of the telescope. With the increase in power over the centuries, telescopes have allowed astronomers 62.__________(make) more and more discoveries about 63. ________ nature of the first telescopes 64._______(use) glass lenses to focus their light, while most modern telescopes now use mirrors as their major light 65. __________(collect). In a lens telescope, the light must pass through the lens, so the lens must be entirely perfect. 66._______ in a mirror telescope, the light 67. __________(simple) bounces off the means that only the surface of the mirror must be perfect, making it much 68. ________(easy) to manufacture large mirrors. Making larger and larger mirrors for telescopes 69. _________ ( be) important because a telescope’s power is directly decided by the size of its mirror. Therefore,the primary concern 70._________ astronomers is to get the largest mirror possible for their telescope.    

【回答】

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