No Matter Existed,
only a Singularity.
Singularity inflated.
Radiant energy filled
the universe and
elementary particles
came into existence.
Pre-existing
matter
such as quarks made
up new particles.
Atomic Nuclei was
formed.
Subatomic particles
were created.
Proton and neutron
fused.
Heavier nuclei were
formed
through
series of nuclear
reactions.
Cloud
of cosmic
dust and gases from the
Big Bang cooled to the
extent that nuclear fusion
process was no longer
taking place.
Stars formed, and then
grouped together to form
galaxies and universe
continued to expand up to
the present times.