Why, when the satellites of Jupiter pass through its disk, at the edges of the disk, the satellites seem to be light points

Why, when the satellites of Jupiter pass through its disk, at the edges of the disk, the satellites seem to be light points, and in the middle of the disk – dark?

Two factors contribute to this phenomenon: the lower reflectivity of the satellites compared to the planet’s surface and the darkening of Jupiter’s disk towards the edge.

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