View your list of saved words. (You can log in using Facebook.)
Model universe developed in 1922 by the Russian meteorologist and mathematician Aleksandr Friedmann (1888–1925). He believed that Albert Einstein's general theory of relativity required a theory of the universe in motion, as opposed to the static universe that scientists until then had proposed. He hypothesized a big bang followed by expansion, then contraction and an eventual big crunch. This model supposes a closed universe, but Friedmann also proposed similar solutions involving an open universe (which expands infinitely) or a flat universe (in which expansion continues infinitely but gradually approaches a rate of zero). See alsoEdwin P. Hubble.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Friedmann universe, visit Britannica.com.
Seen & Heard
What made you look up Friedmann universe? Please tell us what you were reading, watching or discussing that led you here.