“伟大的天文台”是以天文学家哈勃为名，在轨道上环绕著地球的望远镜，它是世界上最大、图像最清晰的天文望远镜。他的位置在地球的大气层之上，因此获得了地基望远镜所没有的好处——影像不会受到大气湍流的扰动，视宁度绝佳又没有大气散射造成的背景光，还能观测会被臭氧层吸收的紫外线。于1990年发射之后，已经成为天文史上最重要的仪器。他已经填补了
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