THE BIG BANG The strong explosion released radiation, particles and clouds of atoms. At first, the universe was like a fireball tinier than an atom. As it expanded, it began to cool and tiny particles of energy and matter began to form a thick, soup – like material. Gravity pulled the particles together and atoms joined to make gases, such as hydrogen and helium, and the ‘soup’ began to thin out. Over time, as the young UNIVERSE grew larger, the gases clumped into clouds. After several hundred million years, the clouds began to form stars and galaxies.
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