
#science
The Universe encompasses everything known: matter, energy, space and time. The scales in the universe are so big that we can't even imagine them.
To give us an idea, for every grain of sand on Earth, there are a million stars, or more.. Our galaxy is only one among hundreds of billions of galaxies.
Even so, all the matter of the Cosmos is only a very small part of the universe. The Universe is above all an immense almost empty space.
It is impossible to know the exact size of the Universe. It might even be infinite, although it doesn't seem likely. Not knowing what shape it has, we can't calculate its size either.. In addition, it continues to expand. We only know the size of the Universe visible from Earth.
The limit of the universe visible from Earth is 46.5 billion light years, in all directions. That is, a diameter of 93 billion light years. A light year is 9'46 billion kilometers.
The calculation is huge, and yet, it's just the part of the universe that we can see. After the Big Bang, the Universe expanded so quickly that some of its light has not yet reached us and, therefore, we can't see it.
photo of pixabay
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