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Matter is everything that has mass. All matter is made up of particles. They are like tiny pieces that come together to form everything we see.
Although they also form another type of matter that we cannot see, dark matter. In fact, most of the matter that makes up the Universe is dark matter.
Everything that has mass, however small, emits gravity. Even ourselves. In the Cosmos, matter is attracted by that gravity. It is grouped and formed from small molecules to planets, stars and large galaxy clusters. Gravity holds matter together. Even so, most of the matter is not concentrated in galaxies, but in the vast intergalactic spaces.
The part of the matter that we can see is only 5% of the composition of the Universe. Visible matter is called ordinary matter or barionic matter.
Ordinary matter is made up of atoms. It can be in four states: solid, liquid, gas and plasma. It passes from one state to another when it gains or loses heat. Most of the visible matter of the Universe is in a plasma state, since it is the one that forms the stars.
In the Universe there is another type of matter, which we cannot see. It is dark or invisible matter. The fourth part of the known Universe is dark matter, although some sources estimate that it is up to 80%. This means that there is much more dark matter than visible matter.
Dark matter does not emit or reflect any type of light. It does not give off any type of radiation, neither visible nor invisible. That's why we can't see her. But we know that it exists because it does emit gravity, and our technology detects it. Its gravity is so great that it moves the great galaxy clusters.
The composition of dark matter remains a mystery. Although it is believed that it could be formed by neutrinos and other still unknown particles.
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