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180 degrees Alan Guth Albert Einstein angles arcsecond Arthur Eddington astronomers bending of light Berlin big bang Bolyai century colleagues cosmological constant cosmologists critical density curvature deflection derived detected developed discovered discovery distance eclipse Eddington Einstein wrote Einstein's equation Einstein's field equation Einstein's theory energy equa equation of gravitation Euclidean expand forever expansion expedition explosion flat four-dimensional Freundlich galaxies Gauss German gravitational field Grossmann Hilbert Hubble idea infinity inflationary later letter light rays look mass density massive object mathe mathematician mathematics matter metric metric tensor Neta Bahcall neutrino Newton's non-Euclidean geometry Observatory observed paper particle Paul Steinhardt physicist physics Planck Prague problem quantum theory radiation redshift Riemann Saccheri Saul Perlmutter scientists Sitter Sobral space space-time special relativity special theory speed of light stars stein Steinhardt studied supernovae surface Swiss telescope tensor theory of relativity tion topology universe variable verse Zurich