•Einstein (1915) and General Relativity, in 1917 uses the cosmological constant to get a static universe
solution (“Greatest
blunder of my career.”)
•
•de Sitter, Friedman, and Lemaitre follow, with more solutions covering a variety of situations, including
no matter, closed
universes, and expanding universes (and this is all before Hubble found and expanding
universe)
•
•Cosmological constant was handy, however, for reconciling Hubble’s universe age with the age of Earth,
and handy today in
reconciling otherwise conflicting data.
•