Whose theoretical work, rooted in Einstein’s General Relativity, proposed a model for an expanding universe that Hubble's observational data later substantiated?
Answer
Georges Lemaître
While Edwin Hubble provided the concrete, systematic observational evidence in the 1920s and 1929 that proved the universe was expanding, the theoretical groundwork for such a concept predated his final conclusions. Georges Lemaître was instrumental in developing theoretical models suggesting an expanding cosmos. These models were derived directly from the equations of Einstein’s General Relativity. Hubble's measurements of redshift and distance provided the necessary empirical validation, confirming that the universe behaved as Lemaître's theories had predicted.
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