Lemaître’s insights were in fact key in almost all the important milestones of early modern cosmology, from the expanding universe, to the cosmological constant, to black holes. He was first to see how the Einstein and de Sitter models were but two limited cases of a larger body of expanding universe models; he was the first to see that such models had to evolve from a super-dense state; and perhaps most importantly – from the very beginning – he was the first to tie the predictions of relativity about cosmology to actual astronomical observations.
The Day Without Yesterday, Lemaître, Einstein and the birth of modern cosmology
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