It would be great if you could see the distance in light years from the Earth to every star, constellation or planet, when you select one of them.
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Check out this modification to the planet_names.eng.fab that I have tinkered with;
This shows a small note for value of moon diameter;
I have thought of other "small notes", but consider how easy it is to get away from the beauty of Stellarium's simplicity.
Thus it may be better to follow the idea of "LESS IS MORE";
Clear Skies --- Silveradogold