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What do the orbs represent?
The orbs represent the planet’s position and they are not scaled to their actual size. The actual size of the planet is the little nub on the top of each orb. The size of Earths’ nub is 0.6mm, Venus and Mars are 0.5mm, and Mercury is 0.3mm. The distance from the Earth nub to the sun is the 93 million miles we all learned about in science class, at the 20 billion to one scale. For a sense of size imagine us walking around on the small Earth nub. The moon orbits this 0.6mm Earth about ¾ of an inch away.