２１ The Big Bang model【What is the Universe？】Dialogue with the Universe
：The Big Bang model is the cosmology to which it is supposed that the universe began large expansion suddenly from one point extraordinarily smaller than one atom about 13,700 million years ago.
・It is 1/10 billion seconds after the Big Bang that materials which constitute the universe, such as nuclear particles (proton and neutron) and an electron, were produced. (←separation of electromagnetic power and weak power) = birth of the fundamental power of the universe.
※ The fundamental power of the universe
1) Electromagnetic power : power which connects a proton and an electron (a chemical reaction is based on electromagnetic power)
3) Nuclear force : power which combines a proton and a neutron (it is what is called atomic power)
4) Weak power to which the radioactive decay of the neutron (β disintegration)
※The center of The Big Bang ：Only we know that the universe is accelerating expansion, we can not indicate where the center.