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对天文学家来说,光是一种稀罕的东西,因此为接收它,他们作出了很多努力。宇宙间遥远天体发出的光很微弱,即使最大的天文望远镜接收到的也微乎其微。所以在接收
To astronomers, light is a rarity and so much effort has been made to receive it. The light emitted by distant celestial bodies in the universe is weak, even if received by the largest astronomical telescope. So in the reception