<prompt> Izixazululo ze-Isotropic ne-homogeneous zalezi zindlela zokulinganisa ezenziwe ngcono, izixazululo ze-FriedmannLemaîtreRobertsonWalker, zivumela izazi ze-cosmological ukuba zilinganise indawo yonke eye yavela eminyakeni eyizigidi eziyizinkulungwane eziyi-14 kusukela esigabeni esishisayo, sokuqala se-Big Bang. Uma inani elincane lamapharamitha isibonelo, ubukhulu bendaba bendawo yonke selibekiwe ngokubhekwa kwe-astronomical, idatha yokubheka eyengeziwe ingasetshenziselwa ukubeka amamodeli ekuhlolweni. Izibikezelo, zonke eziphumelelayo, zifaka phakathi ubuningi bokuqala bezinto zamakhemikhali ezakhiwe esikhathini se-nucleosynthesis yasekuqaleni, isakhiwo esikhulu somkhathi, kanye nokuba khona kanye namagugu we-thermal echo kusukela ekuqaleni kwendawo yonke, ukuhlolwa kwe-cosmic background. Ukuhlolwa kwe-cosmological kwe-cosmological kwe-cosmological kwe-cosmological kwe-cosmological kuvumela ukuthi inani le-cosmic liguquke eminyakeni eyi  <response>: amandla adonsela phansi 