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Monday, October 3, 2016

The First Stars in the Universe could provide clues about Dark Matter

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The first stars appeared in the Universe which might contain clues to provide more explanations about the origin of dark matter, a substance that still retains its mysteries, 70 years after it was discovered by researchers, informs AFP.

Based on mathematical models created on your computer, researchers at the University of Durham, UK, concluded that dark matter, which is of two types, "hot" and "cold" was essential to the formation of the first stars in the Universe .

Shortly after the Big Bang, which occurred 13.7 billion years ago, matter which form when the Universe was smooth as the surface of a river, with a few small undulations. These undulations extended under the effect of gravity which act on dark matter particles contained. Between these particles penetrated gas, and in this process occurred first stars, about 100 million years after the Big Bang, according to the researchers.

British experts say that a large number of stars of different sizes so the vast explosions occurred simultaneously resemble long filaments, which suddenly became incandescent.

Stellar Evolution Photo:

Liang Gao, one of the co-authors of the study, explained that "these filaments of measurements about 9,000 light years, or a quarter of the length of the Milky Way" galaxy of which the Earth.

Stars born in such dark matter "hot" with a lower density, should still exist in the Milky Way and their analysis should provide clues to unravel the mysteries of dark matter, according to astro-physicists.

Instead, the first stars formed from dark matter particles "cold" were denser and could not survive as much as those formed from matter "hot", according to the mathematical model devised by researchers.

US astronomers announced in May that they had uncovered a ring of dark matter in a galaxy cluster, which is probably the most important so far this mysterious substance that forms over a fifth of the universe.

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