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The Universe encompasses everything known: matter, energy, space and time. The scales in the universe are so great that we can't even imagine them.
To get 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, the whole matter of the Cosmos is only a very small part of the universe. The Universe is, above all, a huge space almost empty.
It is impossible to know the exact size of the Universe. It could even be infinite, although it doesn't seem likely. Not knowing what shape it is, we can't calculate its size either. In addition, it continues to expand. We only know the size of the Universe visible from Earth.
|Solar system||1 light month|
|Milky Way||100,000 light years|
|Local group of galaxies||10 million light years|
|Virgo supercluster||100 million light years|
|Visible universe||93,000 million light years|
Visible Universe Size
The limit of the Universe visible from Earth is 46.5 billion light years, in all directions. That is, a diameter of 93,000 million light years. A light year is 9.46 billion kilometers.
The calculation is huge, and even then, it is only the part of the Universe that we can see. After the Big Bang, the Universe expanded so quickly that part of its light has not yet reached us and, therefore, we cannot see it.
But if the Universe is only 13.8 billion years old, how can there be objects further away? Is it possible that they moved away faster than the speed of light? The answer is the inflation of the Universe.
Inflation is the origin of everything: of space itself, of time, and of all known physical laws, including the speed limit of light. Everything is created in inflation itself. So the inflation of the Universe is not subject to the speed limit of light. Inflation creates new space between objects and moves them away.
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|Advanced Universe||Structures of the Universe|