Dark Matter Extends from Galaxies far Into Intergalactic Space

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A group of Japanese physicists has revealed where dark matter is for the first time. As it turns out, the mysterious substance is almost everywhere, drooping throughout intergalactic space to form an all-encompassing web of matter.
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Dark matter is invisible, It doesn’t interact with light, because of that astronomers cannot actually see it. So far, it has only been observed indirectly by way of the gravitational force it exerts on ordinary, visible matter. On the basis of this gravitational interaction, physicists have inferred that dark matter constitutes 22 percent of the matter-energy content of the universe, while ordinary detectable matter constitutes just 4.5 percent. By determining how light from the galaxies was bending slightly as it passed through space en route to Earth, the researchers were able to work out the location of the dark matter that was bending it. As detailed in a study their model shows that dark matter extends from each galaxy far into intergalactic space, overlapping with the dark matter from adjacent galaxies to form a pervasive web that envelops the whole universe. According to researchers in fact, intergalactic space is a misnomer, galaxies aren’t contained regions with well-defined edges that are separated from one another by millions of light-years. Instead, they are composed of a central clump of ordinary, visible matter surrounded by a web of dark matter that extends  in an organized way halfway to the neighboring galaxy, so that the universe is filled with the material associated with galaxies. The group mapped the distribution of dark matter over a distance of 100 million light-years from the center of each galaxy.
source:www.space.com

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