'S e teòirig a tha a' toirt modal de is cunntas air tùs an domhain a tha anns a' Bhrag Mòir.
Anns na 20an, lorg Edwin Hubble gun robh a h-uile reul-chrios a' dol air falbh aig luaths a bha cuideil ri astar. Ann an 1931 mhol Georges Lemaître gun do thòisich an domhan ann am Brag Mòr mar a bha fillte a-staigh sna tomhasan aig Hubble.
A rèir na teòirige bi rèididheachd chosmaig meanbh-thuinn bho a h-uile cùrsa ann am fànas, an rèididheachd chosmaig chùlanach, air sgàth 's gun robh an domhan glè theth o thùs is e air fuarachadh mar a tha e ag atachadh. Ro-innis Robert Alpher seo ann an 1948 is lorg Arno Penzias is Robert Wilson le tuiteamas ann an 1965 e.
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