Glossary term: 望远镜
Description: 望远镜是一种收集遥远物体的光子（可见光或其他波段）并向观察者提供有关信息（如图像）的装置。早期的望远镜（从 17 世纪初开始）使用透镜作为光学元件（如折射望远镜）。透镜的制作尺寸有上限，因此为了用更大的望远镜更细致地观察较暗的物体，人们改用镜子（见反射望远镜）来聚焦光线。最大的光学望远镜就是反射望远镜。在20 世纪，人们发明了研究电磁波谱其他波段的望远镜，因此现在有了射电望远镜、红外望远镜、X 射线望远镜等。由于天体很暗弱，天文学家倾向于建造大口径望远镜，以收集更多光线，达到更精细的角分辨率。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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