问题描述：
[问答]
为什么哈勃空间望远镜能够比我们在地面上观测到更暗的天体？What are the reasons why the Hubble Space Telescope is able to observe fainter objects than we can study from the ground
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上一篇：为什么射电天文学家可以在白天观测,而光学天文学家的绝大多数观测只能在夜晚进行？ Why can radio astronomers observe during the day, whereas optical astronomers are (for the most part) limited to nighttime observing
下一篇：口径10米的凯克望远镜已经在夏维夷的莫纳克亚投入运行,那里的星像直径可以小到0."3,请你估算一下用凯克望远镜进行目视观测的极限星等？Recently the Ten-meter Keck telescope began to operate on Mauna Kea (Hawaii),where the diameter of stellar images may be as small as 0".3. Can you evaluate the limiting stellar magnitude for visual observation with this telescope
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