That means a massive object such as a galaxy can act like a lens, bending light from things behind it to a focal point in front of it, and forming a natural telescope.
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美
释义
这意味着,如星系这样庞大的物体就好像一块透镜,将它背后物体射出的光折射到它前面的某个焦点,形成一个天然的望远镜。
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