one theory is that the original 'chunk' originated as a 'virtual particle' from yet 'another universe'. it was infinitely hot, infinitely condensed and expanded rapidly - initially faster than the speed of light, accounting for why there are parts of our universe where light hasn't had time to reach. as the expansion rate slowed, matter began to condense, initially as hydrogen, next helium..then more elements. they began to combine and form giant stars. the giant stars were so great in size that they collapsed under the 'weight' of their own density (faster than they could grow outward). once they collapse, they leave a black hole and throw chunks of matter out once again, forming new stars and planetoids. at some point, a smaller star - one which was more stable (billions rather than millions of years) - formed and a number of planets formed around it. you live on one of those. gradually, an atmosphere formed and 'life' began from more complex aggregates of elements in the sea until something walked out of it onto land. 'it' evolved into a land mammal and eventually you came along..
or something like that..