The app creator made the right decision when he defaulted to a false scale. Scale is not the only important thing to convey, one also wants to show relationships and have a model of the whole that fits in a monkey brain.
Also, in this interface, the planets serve as big "buttons" to navigate to a celestial body of interest. So they have to be larger.
The thing would be unusable, and boring, if it showed specks of dust orbiting a mustard seed.
The thing is that it doesn't look to scale to me. But that's probably because most other visualizations/models are not right. Especially in the distances. I checked some other images and while the planets seem to scale, my brain multiplies the size of the planets with the distance ratio.
I'd like to knock up a solar system in a right scale and I wondered how can I do that. Now that I see this article I think I just can't, not in a regular room at least. I guess I will not have my solar system in an accurate scale hung on my ceiling. Too bad
Also, in this interface, the planets serve as big "buttons" to navigate to a celestial body of interest. So they have to be larger.
The thing would be unusable, and boring, if it showed specks of dust orbiting a mustard seed.
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