The universe is everything, no exceptions.
Matter, energy, space and time, all that exists is part of the universe. It is very large, but not infinite. If it were, there would be infinite infinite star matter, and isn't. In terms of matter, the universe is, above all, empty space.
The universe contains galaxies, Galaxy clusters and larger structures called Superclusters, and Intergalactic matter. We still don't know exactly the extent of the universe, despite the advanced technology available today.
The matter is not distributed evenly, but it is concentrated in specific places: galaxies, stars, planets... However, 90% of the universe is a dark mass, which can not be seen. For every million atoms of hydrogen the 10 most abundant elements are:
Our place in the universeOur world, the Earth, is minuscule compared with the universe. We are part of the Solar system, lost an arm in a galaxy that has 100 billion stars, but is only one among the hundreds of billions of galaxies that formed the universe.
He says making 13,700 million years ago the matter had infinite density and temperature. There was an explosion of violent and, since then, the universe loses density and temperature.
The Big Bang theory explains how formed
The Big Bang is a singularity, an exception that cannot explain the laws of physics. We know what happened from the first moment, but the timing and size zero do not yet have scientific explanation.
Translated from the website: http://www.astromia.com/