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etvfutures.com October 22, 2017


Scientists locate half of the universe's missing ordinary matter

11 October 2017, 08:53 | Lucia Cruz

Image Credit NASA

Missing Matter

Scientists have been faced with this cosmological problem for many years-there is a huge imbalance between how much we see and how much our models say should be there.

According to current theories regarding the formation of Earth, only 10 percent baryons were visible and about 90 percent of the baryonic matter seem to be missing from the shinier parts of our cosmos.

A term, Baryonic matter if used in the astronomy, which consists of a large number of particles of building-block that take place in the high school text book of physics including neutrons, protons and electrons. They found out that long strands or threads of baryonic matter filaments are present in the space between the galaxies which act as a bridge between them. Two teams of researchers have now claimed to have resolved this issue. These simulations have hinted about the fact that all the galaxies in the Universe are connected with long filaments of regular matter but scientists could not get any evidence regarding those connections or so-called missing matter.

The scientists analyzed data obtained by the orbiting observatory Planck, created to study the cosmic microwave background (CMB), which remained after the Universe became transparent to thermal radiation. As this light moves through hot gas, some of it scatters, leaving a patch in the CMB. The other team, from the University of Edinburgh, concluded that the figure was about six times the average density. Because the tendrils of gas between galaxies are so diffuse, the dim blotches they cause are far too slight to be seen directly on Planck's map. Tanimura's group found they were nearly three times denser than the mean for normal matter in the universe, and de Graaf's group found they were six times denser - confirmation that the gas in these areas is dense enough to form filaments.

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Hideki Tanimura, leader of one of the groups in France, told the New Scientist that the missing baryon problem had been solved.

Ralph Kraft, from the Harvard-Smithsonian Center for Astrophysics in MA, said the findings help align the discrepancy between observations and simulations of the universe.

Tanimura's paper has been submitted for publication in the Monthly Notices for the Royal Astronomical Society, while de Graaff's has been submitted to the Nature journal.



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