01:At the start, the Universe was a hot and dense ball of radiation energy.
02:In one-thousandth of a second, tiny radiation particles produced by tiny particles of matter. These combined to form the first ever chemical elements, hydrogen and helium.
03:Some regions of the young Universe contained slightly more hydrogen and helium than others. These shrank to form the first stars.
04: Nuclear reactions inside the stars produced many other chemical elements, including carbon and oxygen.
05:The elements in the universe today were produced from elements created in the Big Bang.
