Georges Lemaitre was one of the 'Big Four' to develop the Big Bang theory along with Alexander Friedmann, Howard Robertson and Arthur Walker.What's in a name? Although it might help if you understand that it bears no relation to what an atom means today or even in Democritus' time. Le Maitre was speculating, and it turns out not to be quite what he speculated.
It incoherent to base this thread on a theory proposed by Lemaitre which is nearly a century old and clearly wrong given the advances in cosmology, atomic and particle physics in the meantime.
By today's standards Friedmann, Robertson and Walker probably have a more lasting legacy.
Friedmann developed the mathematics behind expansion while Robertson and Walker rigorously proved the metric describing expansion is the only one in spacetime which is consistent with an isotropic and homogeneous universe.
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