Our universe consists of 95% dark matter and
5% visible matter but have you ever think
that how a single atom of this visible matter
had been made in this universe?
Today in this video I am going to answer you
this question.
After the Big Bang our universe was a hot
a dense plasma of photons, leptons and quarks.
At one microsecond the universe expanded and
cooled sufficiently to allow the formation
of protons.
Since recombination occurred about 380 thousand
years after the big bang.
At that time the temperature was high enough.
Show that the electrons and protons were scattered
in all directions.
And the condition were not favourable for
the formation of first hydrogen atom.
If we were present to see this universe at
that time, then we would have seen this universe
extremely dark because not a single Photon
could reach our eyes at that time.
Although each electron and proton would release
photons after interacting with each other.
This released Photon used to interact with
other group of electrons or protons which
would not let him to get out of their interactions
so that it could reach our eyes.
You can compare this situation with the current
interior state of the sun where a photon take
thousands of years to come out of the sun
surface.
As the universe cooled to about 3000 K, the
electrons and protons combined to form the
universe first hydrogen atom and the photon
which were trapped between them get released
which we see as cosmic microwave background,
one of the key evidence of Big Bang Theory.
So guys that's all for this video if you have
not watch my previous video then please also
watch those video and if you haven't like
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