Ratio aspect between Jupiter and its moons

Feb 17, 2023

Looking at the attached picture that show Jupiter and its four biggest moons, it seems the Io, Europa, Ganymede and Callisto have a ratio dimensions about 1:10 with Jupiter.
But Jupiter have a diameter of 140000 km and its moons an average of 4000 km so the real ratio is 1:35.
Why does it happen this illusion?

Everything has a certain amount of blur around the edges due to the atmosphere , optical imperfections, dirt and reflections on the lenses. It doesn't much affect the size of a large target such as Jupiter but it can dominate a small target such as the moons making them appear much larger than reality.
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