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[问答]
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
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上一篇:为什么对于有些研究课题使用位于山顶的中等口径望远镜要比使用位于低轨道飞船中的望远镜更好? Why is it better for some purposes to use a medium size telescope on a mountain instead of a telescope on a spaceship at low orbit near the Earth
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