We do not know the radius of space to-day, but I should estimate that it is not less than ten times the original radius.
[square-bracket comments and emphasis added] single atom] had not yet been proposed.
- Sidney van den Bergh of Canada's National Research Council writes at Cornell's that it is unclear who was responsible for the omission but he reports of the 1931 Monthly Notices "authorized translation of Lemaître's  discovery" that the "mention of the expansion of the Universe was omitted from the English version of both Eqn.
As is known today about the famed astronomer: - Vesto Slipher's name doesn't appear in Hubble's 1929 paper though most of the radial velocities presented were his.- Hubble wrote to astronomer JH Reynolds asking him to refrain from publishing that which Hubble later published without reference to Reynolds.- Hubble wrote to de Sitter in 1930, "I consider the velocity-distance relation [i.e., "Hubble's Law"], its formulation, testing and confirmation, as a Mount Wilson [i.e., Hubble] contribution and I am deeply concerned in its recognition as such." Clearly.- The astronomy establishment, Nasa, et al., psychoanalyzes Lemaître and claims that he was humble and did not desire "establishing priority for his original discovery." So perhaps RSR could be forgiven for trying our own hand at psychoanalysis.As widely documented and shown below, published theoretical and observational considerations that pre-dated Hubble suggested that many galaxies are receding.] The universe was expanding after all, just as General Relativity originally predicted! GR can support a static, contracting, or expanding universe.] ...
In other words, the Hubble law is just what one would expect for a homogeneous expanding universe, as predicted [retrodicted] by the Big Bang theory.
- 1918 Carl Wirtz [translation]: "..system of spiral nebulae is drifting apart by a velocity of 656 km with respect to the momentary location of the solar system as the center." - 1922 Alexander Friedmann: On the curvature of space.
[Unlike Einstein's (& Newton's) difficulty in explaining why the universe doesn't gravitationally implode, Friedmann made an interpretation of general relativity that indicated an expanding universe.
Eddington then goes on to present a few pages of musings on entropy and time and then estimates the fine-tuning of the physics of the universe as more unlikely than one chance in ten raised to the hundredth power.
In that paragraph, he states, "Philosophically, the notion of a beginning of the present order of Nature is repugnant to me." Lemaître seized upon this statement in his very brief letter published two months later in the journal Nature proposing what became known as the big bang theory.
Consider also from Ostriker & Milton, for Lemaître in "Belgium in 1925...