The missing visible matter is actually hiding at the threshold of galaxies
(Mirror Daily, United States) – Scientists have always been fascinated by the dark matter which comprises the universe, often neglecting the visible matter which is also a part of it. However, most of this matter appeared to be missing which, again, kept puzzling scientists for a longer period of time. Now, they finally managed to find out what was going on with it, and discovered it was merely hiding.
This matter was presumed to occupy the space between galaxies, and was called baryonic matter. Previous models of the shape of the universe indicated it hid right at the boundaries of galaxies, making itself difficult to be observed. Now, scientists obtained the first evidence which confirmed this hypothesis.
Baryonic matter is made up mostly of typical particles, namely protons, electrons, and neutrons, and comprises only 4.6 percent of the universe. The rest of it is dark matter. These kinds of visible particles surround cosmic objects, such as stars, and emit light. By studying this light and then correlating it with what we know about the size of the universe, we can get an idea of their expansion.
Some of the visible matter in the universe appears to be hiding
However, the result doesn’t account for all the visible matter that should be there, and about 90 percent of it seems to be missing. However, a physical phenomenon helped scientists prove baryonic matter hid behind galaxies.
This phenomenon is called the Sunyaev-Zel’dovich Effect, and causes the scattering of the photos left out after the Big Bang. These photons are scattered when they pass through galaxies and the electrons which surround them. The particles have been studied by two different teams, and were situated at different distances from Earth.
Therefore, the two teams, one from the University of British Columbia, and the other from the University of Edinburgh, obtained different results. However, the results are still consistent, and would accurately account for the distribution of visible matter across the universe.
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