How much do we know about the universe?

The range of the universe that we currently know is extremely vast. Scientists estimate that there exists an observable universe with a diameter of about 93 billion light-years.
This is a value calculated by considering the maximum distance light could have traveled since the Big Bang — that is, the age of about 13.8 billion years — together with the expansion rate of the universe. Within this, it is reported that there exist about 2 trillion or more galaxies and far more stars than that.
According to the current standard model, the universe is composed of about 5% ordinary matter, 27% dark matter, and 68% dark energy.
However, dark matter and dark energy have not been directly observed, and they are only estimated through indirect evidence such as gravity and the rate of expansion of the universe.
By observing the cosmic microwave background radiation that formed about 380,000 years after the Big Bang, we can calculate backward the state of the early universe, but the Planck epoch immediately after the Big Bang still remains an unknown realm.

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