'But in fact what was being metaphorized were two dissimilar phenomena, since the planetary system’s motions work in terms of gravity, whereas inside the atom it is electrical forces that obtain. And so the metaphor started growing ragged and incoherent very quickly; it went from positive analogy to negative analogy. If the model was a planetary one, then how come the electrons were not continually losing energy in their orbits, as one would expect? If the inside of an atom were really functioning according to its metaphoric other half then the electron would soon lose its necessary energy and spin counter-clockwise into the nucleus.'
Sarah Kliff on the Big Questions
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