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Dark matter is probably part of this theme throughout the universe fascinates us the most - and that's hard to do. There are so many wonderful things to see and learn, but we know very little about the dark matter.
So what we know about dark matter? Well, it "establish the existence of gravitational effects on visible matter and the background radiation," he says "something is acting on the things we see, like the planets and stars, and we can see some of the radiation bottom of it. " This is how its existence came to be hypothesized. There were discrepancies between the measurements of the mass of galaxies, clusters of galaxies and the whole universe on the basis of the measurements to see "light" matter (stars, etc.)
The amazing what me is that according to the comments and Friedmann equations FLRW metric dark matter represents 23% of the mass-energy density of the observable universe. By comparing this with the measurement of 4.6% of ordinary matter that can be obtained from these figures that the dark matter, in fact, represents 80% of matter in the universe! 80%! The space is huge!
Much of the evidence for dark matter comes from studying the motions of galaxies. Many of these seem to be fairly uniform, so by the virial theorem the total kinetic energy should be half the total gravitational binding energy of the galaxies. However, when a pilot is the total kinetic energy turns out to be much higher: namely assuming the gravitational mass is due solely to the visible matter in the galaxy, stars near the center of galaxies have much higher velocities than predicted by the virial theorem.
All this demonstrates to us that there is some kind of dark matter, but what is? Well, this is still unknown. A substantial body of evidence indicates that there may be something called baryonic matter (ie, protons and neutrons). The most favored theory is that dark matter is composed mainly of something known as "exotic particles, which were formed when the Universe was a fraction of a second old. These particles, which would require an extension of the so-called Standard Model of elementary particle physics, could be "weakly interacting massive particles (WIMPs), or axions, or sterile neutrinos. A typical WIMP is expected to at least 100 times as massive as a hydrogen atom.
What is known about dark matter is what is probably not as black hole (there are too few to justify the difference in mass of a star).
The investigation is continuing as we continue trying to understand and comprehend the structure that holds our universe. The wonder of the universe is not only keeping the stars who have all the glory, but for the "glue" that holds everything together well.
Article Source: http://www.articlesGiant.com
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Dark Matter
Dark matter is probably part of this theme throughout the universe fascinates us the most - and that's hard to do. There are so many wonderful things to see and learn, but we know very little about the dark matter.
So what we know about dark matter? Well, it "establish the existence of gravitational effects on visible matter and the background radiation," he says "something is acting on the things we see, like the planets and stars, and we can see some of the radiation bottom of it. " This is how its existence came to be hypothesized. There were discrepancies between the measurements of the mass of galaxies, clusters of galaxies and the whole universe on the basis of the measurements to see "light" matter (stars, etc.)
The amazing what me is that according to the comments and Friedmann equations FLRW metric dark matter represents 23% of the mass-energy density of the observable universe. By comparing this with the measurement of 4.6% of ordinary matter that can be obtained from these figures that the dark matter, in fact, represents 80% of matter in the universe! 80%! The space is huge!
Much of the evidence for dark matter comes from studying the motions of galaxies. Many of these seem to be fairly uniform, so by the virial theorem the total kinetic energy should be half the total gravitational binding energy of the galaxies. However, when a pilot is the total kinetic energy turns out to be much higher: namely assuming the gravitational mass is due solely to the visible matter in the galaxy, stars near the center of galaxies have much higher velocities than predicted by the virial theorem.
All this demonstrates to us that there is some kind of dark matter, but what is? Well, this is still unknown. A substantial body of evidence indicates that there may be something called baryonic matter (ie, protons and neutrons). The most favored theory is that dark matter is composed mainly of something known as "exotic particles, which were formed when the Universe was a fraction of a second old. These particles, which would require an extension of the so-called Standard Model of elementary particle physics, could be "weakly interacting massive particles (WIMPs), or axions, or sterile neutrinos. A typical WIMP is expected to at least 100 times as massive as a hydrogen atom.
What is known about dark matter is what is probably not as black hole (there are too few to justify the difference in mass of a star).
The investigation is continuing as we continue trying to understand and comprehend the structure that holds our universe. The wonder of the universe is not only keeping the stars who have all the glory, but for the "glue" that holds everything together well.
Article Source: http://www.articlesGiant.com
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