Why did Einstein say that the image of a star could be a ring instead of a point?
为什么爱恩斯坦说恒星的影像是环，而非点？
The mirror of an astronomical telescope forms at its focal point an image of a star on the axis of the mirror.
天文望远镜把在镜轴上的星体成象在焦点上。
The mirror of an astronomical telescope forms at its focal point an image of a star on the axis of the mirror.
天文望远镜把在镜轴上的星体成象在焦点上。
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