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Dark matter


 Dark matter 

Dark matter is belived to be a from of matter thought to account for approximately 85% of the matter in the universe and about 27% its total mass - energy density or about  2.241×10⁻²⁷  kg/m³ most dark matter is thought to be non baryonic in nature .

Dark matter could be white dwarfs the remnants of cores of dead small and medium size stars or dark matter could be neutron stars or black holes the remnats of large stars after they explode .


Baryonic - baryonic matter should only include matter composed of baryons. In other words, it should include protons, neutrons and all the objects composed of them (i.e. atomic nuclei), but exclude things such as electrons and neutrinos which are actually leptons.


where is all the dark matter ?

The first variety is about 4.5% of the familiar baryouns which also make up the luminous stars and galaxies most of this baryonic dark matter is expected to exist in the form of gas in and between the galaxies .

Has dark matter be founded?


Dark matter, according to mathematical models, makes up three-quarters of all the matter in the universe. But it's never been seen or fully explained.

How much we know about dark matter ?

more is unknown we know how much dark energy there is because we know how it affects the universe expansion dark matter makes up about 27% the rest - everything on earth , everything over observed with all our instruments , all normal matter-adds up to less than 5% of the universe 
there is no concrete proof that dark matter is exist and we currently have no technology available to find that proof .




if you run some cosmic calculation based on physics that the amount visible material in the universe does not add up .

We understand this with an example 

A sprial galaxy like the one we live in , has stars as it's outer edges according to what physics says , these stars should be moving at a much slower pace compared to the ones close to the galactic center but in reality all stars in the galaxy seen to be orbiting it's center point at almost the same speed . Scientists think that , that's dark matter influencing and making the Stars move the way they do.




 

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