Two Unusual Galaxies Shake Up Dark Matter Discussion, Again

Two Unusual Galaxies Shake Up Dark Matter Discussion, Again

Then With regard to the nature of dark matter, astronomers are largely still in the dark. The existence of this mysterious substance was hypothesized over 40 years ago to explain the differences between the calculations that would make the galaxy. In short, the appearance was lacking. Thus, Vera Rubin, the first astronomer who discovered this discrepancy, created an invisible substance much more than a “normal” matter and acts as a scaffold on a large scale universe. Today we call dark matter.

However, decades of hunted particles of obscure matter have not yet given direct evidence of their existence. Most Cosmologists still believe that we need dark matter, but some suggest other explanations that explain the dark matter by changing the understanding of gravity.

However, two findings question the gravity change in the explanation. A group of astronomers led by Pietan van Dokkum Yale and Shany Danieli, their postgraduate student, have published two articles, that is, if they find the existence of a galaxy that is virtually obscure, and the other is a second galaxy. this type In Irony, researchers say that there is a dark matter in that galaxy.

Certainly, these galaxies do not think they are dark matter, because they presuppose their dynamics using traditional theories of gravity. The discrepancy of “lack of mass” seen in most galaxies is not here, that is to say, it does not explain the behavior of dark matter. And it means that the modified version of gravity proposed by cosmologists does not predict that the movements of the galaxies are as clean as good Newtonian functions.

The discovery of the Dark Gauls lasts until 2014, when Van Dokkum and his colleagues built a new type of telescope that was built by Dragonfly, a camcorder with a low telescope, to focus on observing obscure celestial objects. . Only after the first light of the year, Dragonfly discovered a new galaxy without a star according to its size. Known as ultraviolet galaxy, this ghostly celestial object was almost the same as our Milky Way, but only one hundred percent of this mass could be attributed to “normal” matter like stars. In other words, van Dokkum and his colleagues discovered a galaxy that made 99.99 percent dark matter.

Although Galaxy was the only one, its existence is not surprising. Most Kosmologists believe that dense collections of dark matter act like celestial objects as galaxies. In this sense, the general idea of ​​Anže Slosar Brookhaven Laboratory is the astrophysicist: when dark matter collections get a critical density, it falls under its gravity and creates a “dark matter halo”. To turn around, gravitatively attracts hydrogen gas in its center, where stars and, finally, start forming galaxies. The halo galaxy of a dark thing changes to the galaxy and galaxy, but it seems that all galaxies must have at least some Dark matter to keep its shape. Indeed, this hypothesis is exactly what happened next to Dragonfly’s so amazing discovery.

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