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[½»Á÷] 2012/11/02 news of the week@SCIENCE ----------±¨µÀÒ» ÒÑÓÐ1È˲ÎÓë

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Tucson, Arizona 1
Smooth Mirror for Giant Telescope
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Twenty tons of glass¡ªthat¡¯s what went into casting the first of seven mirrors that comprise the light-collecting area of the 25-meter Giant Magellan Telescope (GMT). The 8.4-meter-diameter, single-piece mirror was finished last week. The GMT will peer at the heavens from a remote Chilean mountaintop when it is ready for operations by the end of this decade.

20¶ÖÖØµÄ²£Á§½ö½öÖýÔìÁËÒ»¿é¾µÆ¬£¡25Ã×´óµÄ¾ÞÐÍÂóÕÜÂ×ÍûÔ¶¾µ£¨GMT£©ÐèÒª7¿é¾µÆ¬À´×é³ÉËüµÄ¾Û¹âÇø£¬Õâ¿éÉÏÖÜÍ깤ֱ¾¶´ï8.5Ã׵ľµÆ¬¾ÍÊÇÆäÖÐÖ®Ò»¡£ÔÚ2020Äê֮ǰGMT¿ªÊ¼ÂÄÐÐʹÃü£¬½ìʱËü½«»áÔÚÒ£Ô¶µÄÖÇÀûɽÉÏÄýÍû×ÅÌ«¿Õ¡£


The mirror was cast using a technique pioneered by University of Arizona astronomer Roger Angel. It has been polished to such a high degree of precision that any surface aberrations lie within a margin onetwentieth the wavelength of light.

ÖýÔì¸Ã¾µÆ¬µÄʱºò£¬²ÉÓÃÁËÑÇÀûÉ£ÄÇ´óѧÌìÎÄѧ¼ÒRoger AngelÊ×ÏÈÌá³öÀ´µÄ¼¼Êõ¡£¾µÆ¬µÄÅ×¹â¶È±»¿ØÖƵ½·Ç³£¾«Ãܵij̶ȣºÈκÎÃæÉϵÄÏñ²î¶¼Ð¡ÓڹⲨ³¤µÄ1/20¡£


Six other such mirrors will be fashioned over the next few years. Assembled into a floral design, they will collect enough light to produce images of unprecedented sharpness, helping researchers answer fundamental questions in astrophysics, planetary science, and cosmology.

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Completion of this First mirror should bolster ongoing efforts to raise funds for the $1 billion project£¨ÈçºÎ·­Ò룩, which has so far received commitments of about $300 million from its various partners.

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[ Last edited by myIDname on 2012-11-6 at 10:15 ]
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