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... My question: The expansion is of space-time, is it not?
In GR, do you not explain the orbits of planets in terms of geodesics?
Are these geodesics not curved as a result of the mass distribution in
our solar system?
Yet, is not the space time in our solar system
flat, because there isn't that much mass contained within it?
Is flatness defined strictly in terms of the geodesic followed by light?