When the temperature fell below 10 billion degrees, electrons and photons began to interact and neutrinos began to leave the cloud. As the universe gradually cooled, an environment formed for the quarks to form protons and neutrons. The universe looked like a hot dust cloud because the temperature was still too high for atoms to form.
The things that happened so far only lasted a few seconds and it was not possible for atomic nuclei to form because the temperature was too high. In the next stage that will start and last for 3 minutes, the temperature went below 1 billion degrees. In this period, only the lightest elements in the periodic table, namely Hydrogen, Helium and Lithium nuclei were formed.
For 300 thousand years, the temperature began to decrease gradually, and the atoms began to gather in the nuclei of electrons moving very quickly due to temperature. At the end of 300 thousand years, since free electrons began to gather together, the light which could not find a place to spread before began to slowly infiltrate. The first lights we have just mentioned as cosmic radiance came into being at this time. According to the data of WMAP satellite, 380 thousand years after the big explosion 12% of the universe consisted of atoms, 15% of photons, 10% of neutrons and 63% of dark matter.
To summarize what we have read so far, the creation of the universe took a few seconds, the formation of the first atoms took 300 thousand years and the formation of 12% of the universe from atoms occurred in 80 thousand years.
13,5 billion years have passed after this point until our day. Thanks to gravity, subatomic particles such as electrons, quark and gluon have formed atoms, atoms have formed elements and elements have formed the planets or stars, thus forming our universe.
Our world belongs to a system of a star we call the Sun, which holds eight planets like itself with the force of gravity. This star holds all these planets as well as five dwarf planets, it’s satellites, meteors etc.
The sun is in the galaxy of which we call the Milky Way Galaxy, which holds about 200-400 billion stars under its own gravitation. Each star has its own planets and satellites.
The Milky Way galaxy is found in a universe where 2 trillion other galaxies like itself are found. Each galaxy has an average of 200 billion stars. The Milky Way is about 100 thousand light years, and our universe is 94 billion light years in diameter.
The Big Bang, which has been proved through many different observations, concludes that the universe has been created by a Supreme Creator.