1927 - Georges Lemaître discusses the creation event of an expanding universe governed by the Einstein field equations
1928 - Harold Robertson[?] briefly mentions that Vesto Slipher's redshift measurements combined with brightness measurements of the same galaxies indicate a redshift-distance relation
1929 - Edwin Hubble demonstrates the linear redshift-distance relation and thus shows the expansion of the universe
1938 - Paul Dirac presents a cosmological theory where the gravitational constant decreases slowly so that the age of the universe divided by the atomic light-crossing time always equals the ratio of the electric force to the gravitational force between a proton and electron
1951 - William McCrea shows that the steady state C-field can be accommodated within general relativity by interpreting it as a contribution to the energy-momentum tensor with an unusual equation of state
1963 - Fred Hoyle and Jayant Narlikar[?] show that the steady state theory can explain the isotropy of the universe because deviations from isotropy and homogeneity exponentially decay in time
1968 - Brandon Carter[?] speculates that perhaps the fundamental constants of nature must lie within a restricted range to allow the emergence of life; first use of the strong anthropic principle
1976 - A.I. Shlyakhter (http://alexonline.info) uses samarium ratios from the prehistoric natural fission reactor[?] in Gabon to show that some laws of physics have remained unchanged for over two billion years
1980 - Alan Guth[?] proposes the inflationary Big Bang universe as a possible solution to the horizon and flatness problems
2003 - NASA's WMAP takes first detailed "baby picture" of the universe. The image reveals the universe is 13.7 billion years old (within one percent error) and that the inflationary theory is correct.
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