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Tony Stark
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As observed in published space maps, I have noted that dark matter is present only in those region which already have visible mass around them. Is this really a fact or just my wrong belief?
That means my assumption is partially correct or whollymarcus said:They are associated. In theory, DM because there is more of it, clumped first. And concentrations of DM helped to pull ordinary matter (OM) together by its gravity, leading to regions of higher than average density of OM.
So there is a correlation---regions where there is higher than average density of DM tend also to have pockets of higher than average density OM---not just visible in the form of stars but also gas, dust etc.
But the correlation wouldn't be absolute. there would be regions containing SOME dark matter, maybe just at very low density, in which no significant amount of OM had collected.
I'd be interested to see some of those maps, if you happen to have links to some online ones. DM is hard to detect except where it is in unusually high concentration and there are steep gradients in density that cause an optical distortion of the background (gravitational lensing). I wouldn't expect most DM to register that way---it would be too uniformly spread out. Maybe they just don't show DM where it is below a certain density. Anyway I'm wondering how the maps were made.
I prefer to think of it that galaxies exist in dark matter. There is much more dark matter than their is matter.Quds Akbar said:Dark Matter mainly exists in the halos of galaxies meaning their outer ring and the fact that it exists in galaxies is very important and is one of the reasons the stars in galaxies do not fly away due to the rational velocities of the galaxies, so that extra mass holds it together.
Dark matter is a type of matter that does not emit or absorb any electromagnetic radiation, making it invisible to telescopes and other instruments. It is believed to make up about 85% of the total mass of the universe.
Scientists have observed the effects of dark matter on the rotation of galaxies, the bending of light in gravitational lensing, and the large-scale structure of the universe. These observations cannot be explained by the known types of matter, leading to the theory of dark matter.
The main difference between dark matter and regular matter is that dark matter does not interact with electromagnetic radiation, while regular matter does. This means that dark matter cannot be seen or detected using traditional methods, such as telescopes, but its gravitational effects can be observed.
Dark matter is detected through its gravitational effects on visible matter. Scientists also use indirect methods, such as studying the cosmic microwave background radiation, to infer the presence of dark matter. Efforts are also being made to directly detect dark matter particles using specialized detectors.
The presence of dark matter has major implications for our understanding of the universe and its evolution. It helps explain the structure and formation of galaxies and provides evidence for the existence of other types of matter beyond the Standard Model. Studying dark matter can also give insight into the fundamental laws of physics and the nature of space and time.