艾里斑是点光源通过衍射受限透镜成像时，由于衍射而在焦点处形成的光斑。中央是明亮的圆斑，周围有一组较弱的明暗相间的同心环状条纹，把其中以第一暗环为界限的中央亮斑称作艾里斑。
当你增加孔径的尺寸时，艾里斑会变小。
艾里斑的亮度(点光源恒星的图像亮度)正比于孔径尺寸的四次方。
Airy disk brilliance (the brightness of a point-source stellar image) is proportional to the fourth power of aperture.
在Graney证实了艾里斑欺骗了伽利略后，他决定寻找伽利略同时代的，也许用他们的设备也见到相同现象的科学家。
After Graney realized that Airy disks had tricked Galileo, he decided to search for contemporaries of Galileo who might have seen similar things with their instruments.
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