For example, when looking up the night sky, I can spot more stars in my peripheral vision. But some of them disappear when I look at that very spot directly.
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The photoreceptor cells in our peripheral vision are spread out more, and so the image is blurred. The center of our vision is sharper, but our peripheral vision is better at detecting movement, shadows, and color.
Imagine you are standing in a field looking at a tree. If you focus your gaze directly on the tree, you will be able to see the fine details like the texture of the bark, the shape of the leaves, and the individual branches. If you look at the tree only from the corner of your eye, you will be able to detect movement from the branches swaying in the wind, but the details of the tree will be much less distinct.
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