January 28, 2022

Beyond Going Long

Complete UK News World

Scientists have discovered a cosmic curiosity: this galaxy has no dark matter in it

250 million light-years away from us lies a galaxy called AGC 114905. Its size is the same as the Milky Way, but it still contains thousands of fewer stars than our original galaxy, the portal writes. space.

Theoretical models suggest that such a galaxy should be kept together due to dark matter, but the very large array telescope observations They couldn’t find any of them. Dark matter is a mysterious substance that scientists cannot observe. However, it is estimated that they make up 85% of all matter in the universe.

Dark matter does not emit any light or energy. Its existence has been discussed since the 1920s. Astronomers are beginning to realize that There may be more matter in the universe than they can notice. Since then, the evidence supporting dark matter has only increased.

“The motion of the stars will tell you the amount of matter in the universe. They are not interested in the type of matter, they are only interested in the fact that matter exists,” said Peter van Dokkum, a researcher at Yale University.

Van Dokkum was a scientist who identified a strange galaxy called Dragonfly 44. It is mainly composed of dark matter. At the moment, scientists do not know where they are from dark matter It consists, and therefore it is really difficult to notice in space.

A galaxy without dark matter

Astronomers cannot directly observe dark matter, but they do observe its gravitational influence on all objects in our universe. AGC 114905 is not a random target. In the past, scholars have noticed that This galaxy, along with 5 others, contains suspiciously low dark matter. However, previous observations did not provide any concrete evidence, so scientists focused on the galaxy AGC 114905 again. This time they used the Very Large Array Telescope.

See also  The Slovak National Museum is preparing for the third phase of restoration of the Spis Castle

The Very Large Array Telescope is one of the most powerful instruments on Earth, but the 40-hour observations found no trace of dark matter at all.

“The result was by no means surprising, quite the contrary. We were waiting for it because it fits with our previous measurements,” said Pavel Mancera Pena, an astronomer at the University of Groningen.

AGC 114905 is not the first galaxy to not contain dark matter. A similar galaxy was discovered by astronomers in 2018. It is called NGC 1052-DF2 and is located from us. 60 million light years.

But why doesn’t the galaxy have any dark matter in it? Astronomers hypothesize that another, larger nearby galaxy may have deprived her of it. However, the situation is complicated because there is no galaxy around AGC 114905.

Scientists are currently searching for another galaxy, from a group of six galaxies, which deviate from the standard characteristics. If there are no traces of dark matter in this galaxy either, then this means that there are galaxies in the universe that could exist without this mysterious matter.

You may be interested