<prompt> Qedela lo musho olandelayo: Cishe ngemva kweminyaka eyishumi, phakathi nalokho okwabizwa ngokuthi  <response>: I-Great Debate, uHubble noSlipher bathola ukwanda kwendawo yonke ngawo-1920 ngokulinganisa ukufuduka okubomvu kwe-Doppler spectra evela kuma-nebula e-galactic. Besebenzisa inkolelo-mbono ka-Einstein yokuhlobana kwezinto, uLemaître noGamow basungula lokho okwakuyokwaziwa ngokuthi inkolelo-mbono yokuqhuma okukhulu. Umbono ophikisayo, obizwa ngokuthi umbono wesimo esizinzile waqanjwa uHoyle, uGold, uNarlikar noBondi. 