1993年12月2日至13日,美国“奋进”号航天飞机载着7名宇航员完成了“哈勃”太空望远镜的修复工作,开创了人类在太空修复大型航天器的历史。“哈勃”望远镜是1990年4月25日发射的,它是目前世界上最先进的天文观测仪器之一,总共耗费21亿美元。但在“哈勃”望远镜升空两个月后,科学家便发现望远镜的直径为2.4米的主反射镜边缘过于平坦,这使进入望远 From December 2 to December 13, 1993, the space shuttle Endeavor with seven astronauts completed the restoration of the Hubble Space Telescope and created the history of mankind’s repair of large spacecraft in space. The Hubble telescope, launched on April 25, 1990, is one of the most advanced astronomical instruments in the world, costing a total of $ 2.1 billion. But two months after the Hubble telescope was launched, scientists found that the telescope ’s 2.4 - meter - diameter primary reflector had too flat edges,