Kusho ukuthini lokhu: "Imfundiso-mbono Yesimo Esizinzile"?
Kwezemvelo, imodeli yesimo esizinzile, noma inkolelo-mbono yesimo esizinzile, iyindlela ehlukile kunenkolelo-mbono ye-Big Bang yokuziphendukela kwemvelo kwendawo yonke. Kumodeli yesimo esizinzile, ubukhulu bendaba endaweni yonke ekhulayo abuguquki ngoba izinto zihlala zenziwa. Lokhu kuvumelana nomthetho-sisekelo we-cosmology ophelele, othi indawo yonke esiyibonayo cishe iyafana yonke indawo futhi ngaso sonke isikhathi.  Izinkinga ngemodeli yesimo esizinzile zaqala ukuvela ngawo-1950 nawo-1960, lapho ukubonwa kwaqala ukusekela umqondo wokuthi indawo yonke empeleni yayishintsha: imithombo ye-radio ekhanyayo (i-quasars nemithala yomsakazo) yatholakala kuphela ebangeni elikhulu (ngakho-ke kungenzeka ukuthi yayikhona kuphela esikhathini esidlule esedlule ngenxa yemiphumela yejubane lokukhanya ku-astronomy), hhayi emithala eseduze.  Ukutholakala kwemisebe ye-cosmic microwave background ngo-1964, eyayibikezelwe umbono we-Big Bang, kwanikeza iningi lezazi zezinkanyezi nomhlaba inselele eqondile kumodeli yesimo esizinzile.