全球最大FAST望远镜落成启用
<p>我国500米口径球面射电望远镜“<span word="FAST">FAST</span>”落成启用仪式9月25日在贵州省黔南布依族苗族自治州平塘县举行。“<span word="FAST">FAST</span>”主要用于实现巡视宇宙中的中性氢、观测脉冲星等科学目标和空间飞行器测量与通讯等应用目标。这个有着“超级天眼”之称的望远镜将为我国天文学跻身世界一流行列创造条件。</p><p>请看相关报道：</p><p><span word="With">With</span> <span word="the">the</span> <span word="massive">massive</span> <span word="facility">facility</span> <span word="officially">officially</span> <span word="beginning">beginning</span> <span word="to">to</span> <span word="operate">operate</span> <span word="on">on</span> <span word="Sunday">Sunday</span>, <span word="leading">leading</span> <span word="scientists">scientists</span> <span word="told">told</span> <span word="China">China</span> <span word="Daily">Daily</span> <span word="that">that</span> <span word="foreign">foreign</span> <span word="scientists">scientists</span> <span word="will">will</span> <span word="be">be</span> <span word="welcome">welcome</span> <span word="to">to</span> <span word="use">use</span> <span word="China">China</span>'<span word="s">s</span> <span word="gigantic">gigantic</span> <span word="Five">Five</span>-<span word="hundred">hundred</span>-<span word="meter">meter</span> <span word="Aperture">Aperture</span> <span word="Spherical">Spherical</span> <span word="Telescope">Telescope</span>, <span word="known">known</span> <span word="as">as</span> <span word="FAST">FAST</span>.</p><p>中国的500米口径球面射电望远镜于周日（9月25日）正式开始启用，负责该项目的科学家们表示，欢迎外国科学家们使用该望远镜。</p><p><span word="It">It</span> <span word="is">is</span> <span word="a">a</span> <span word="single">single</span>-<span word="aperture">aperture</span> <span word="telescope">telescope</span> <span word="the">the</span> <span word="size">size</span> <span word="of">of</span> 30 <span word="soccer">soccer</span> <span word="fields">fields</span>, <span word="located">located</span> <span word="in">in</span> <span word="Guizhou">Guizhou</span> <span word="province">province</span> <span word="in">in</span> <span word="southwestern">southwestern</span> <span word="China">China</span>.</p><p>这是一个单口径望远镜，拥有30个足球场大的接收面积，位于中国贵州省。</p><p>这两天的资讯报道中多次出现<span word="FAST">FAST</span>这个词，不过要注意的是，这里的<span word="FAST">FAST</span>是个缩略词，指的是<span word="Five">Five</span>-<span word="hundred">hundred</span>-<span word="meter">meter</span> <span word="Aperture">Aperture</span> <span word="Spherical">Spherical</span> <span word="Telescope">Telescope</span>，即“500米口径球面射电望远镜”。</p><p>光学望远镜（<span word="optical">optical</span> <span word="telescope">telescope</span>）和射电望远镜（<span word="radio">radio</span> <span word="telescope">telescope</span>）都是观测宇宙天体的重要工具。二者的区别在于：光学望远镜是用于收集可见光的一种望远镜，并且经由聚焦光线，可以直接放大影像、进行目视观测或者摄影（<span word="create">create</span> <span word="a">a</span> <span word="magnified">magnified</span> <span word="image">image</span> <span word="for">for</span> <span word="direct">direct</span> <span word="view">view</span> <span word="or">or</span> <span word="to">to</span> <span word="make">make</span> <span word="a">a</span> <span word="photograph">photograph</span>）等；射电望远镜接收的是肉眼看不到的射电波（<span word="radio">radio</span> <span word="waves">waves</span>），跟接收卫星信号的天线锅类似，通过锅的反射聚焦，把几平方米到几千平方米的信号聚拢到一点上。因此，<span word="FAST">FAST</span>的工作不是“看”，而是“听”，依靠500米口径的“大耳朵”来“收听”太空深处物体发出的无线电波。</p>
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