The universe includes all known: matter, energy, space and time. The scales in the universe are so great that we cannot even imagine them. To get an idea, for each grain of sand that are in the Earth, there are a million stars. Our Galaxy is only one hundreds of billions.
Even so, all matter in the Cosmos is only a tiny part of the universe. The universe is, above all, an immense space almost empty.
It is impossible to know the exact size of the universe. It could even be infinite, although it seems unlikely. Not knowing what shape has, we can also calculate its size. In addition, still expanding. We only know the size of the visible universe from Earth.
|Solar System||1 month light|
|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|
Size of the visible universeThe edge of the visible universe from Earth is 46,500 millions of years light in all directions. I.e., a diameter of 93,000 million light years. A light year is 9'46 trillion kilometers. The calculation is enormous, and yet is only the portion of the universe that we can see. After the Big Bang, the universe expanded so rapidly that part of its light has not yet come up to us and, therefore, we can not see.
But if the universe is only about 13,800 million years, how can there be more distant objects? It is not possible that they are far faster than the speed of light. The answer is the inflation of the universe.
Inflation is the origin of everything: from the space, the time, and all the laws of physics, including the limit of the speed of light. Everything is created on own inflation. So the inflation of the universe is not subject to the limit of the speed of light. Inflation creates new space between objects and takes them away.
Translation for educational purposes authorized by: Astronomía: Tierra, Sistema Solar y Universo