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Describe the transformation of radiation into matter where followed the ‘Big Bang’

After the Big Bang… Where the big bang is recorded to begin, the first step was radiation filling the Universe. This took between 10-12 to 10-10 seconds. At this time, the universe is lying in a dense, hot and small state. As proposed by Einstein’s theory of general relativity, the expansion of the Universe can be driven by energy density in the form of matter radiation. As the radiation here was exceedingly larger than matter, it can be excluded (ie. matter doesn't exist). This radiation creates pairs of particles and anti-particles, some of which collide and annihilate back to radiation. These include quarks and anti-quarks, which averaged in number until the cooling of the Universe (and hence the radiation associated with it) which created less off these pairs, and the overall result was quarks greatly outnumbering anti-quarks.
As this occurs, the amount of matter present is increasing due...