It is generally said that the size of our universe is larger than we can imagine, but there are some facts to note.

The Solar System proxima century next to our solar system is a smaller star than the Sun, but it is said that we can not see it with the naked eye. It is 4.5 light years away from our Earth.

So a star twice the size of proxima is 9 light years away, but we can not see a star 18 light years away.

Big Crunch: How will our universe end?

With this concept we can directly see how many stars in the milky way galaxy we see because this galaxy has a diameter of 105700 light years.
It’s natural to feel a mismatch.

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