O4 (20 points) Figures 4.1 – 4.4 are four photos of Messier objects. For each of them, please write down the Messier catalogue number and name the constellation where it is located.
观测第四题(20分) 图4.1 - 4.4是四个梅西耶天体的图片。请写下每一个的梅西耶编号和它所在的星座。
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