After the period of recombination which was also referred to as the dark age , ``clots of matter started to grow by gravitational attraction which later became the first stars (``So how did everything . The stars later clustered together and formed the galaxies and clusters of galaxies . These stars emit ultraviolet radiation ending the dark age of the universe . A million years after the big bang , fully formed galaxies are already present and the nuclear reactions inside the stars have produced...











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