推介几个好的英文科普网站吧，有关天文的 有哪些好的天文网站？
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http://www.2-sky.com/index.html
NASA
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http://www.nasa.gov/ 美国国家宇航局
绛旓細http://www.space.com/astronaut/ 澶┖缃 http://www.nasa.gov/ 缇庡浗鍥藉瀹囪埅灞
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