How many are actually galaxies in the Local Group and what it says about the milky Way?

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2020-02-08 16:20:09

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How many are actually galaxies in the Local Group and what it says about the milky Way? Source:

So look in the Virgo cluster.

Our milky Way galaxy rotates inside the Local Group of galaxies in a relatively quiet area of space. A local Band called gravity associated galaxies, including the Andromeda Galaxy and Galaxy Triangle. The researchers include more than 50 galaxies in a Local Group, but with the discovery of new galaxies their number is constantly growing. Moreover, the milky Way and the Andromeda Galaxy are the largest galaxies in the Local Group. They are surrounded by a group of small galaxies, the most large of which are the Large and Small Magellanic Clouds. These satellites of the milky Way are from us at a distance of 150 to 200 thousand light years.

Local Group — part of the cosmic web

The Closest cluster of galaxies to the Local Group — a cluster Virgo, which is from us on distance about 55 million light-years. In the Virgo cluster. there are more than 2,000 "island universes." Compare this with the Local Group, which, according to confirmed reports, contains about 50 galaxies, and according to unconfirmed — another 30. In this case, the size of most galaxies in the Local Group is not comparable with the size of the milky Way . But that's not all — Local Group — only a small, peripheral part of the supercluster of galaxies, which in total counts more than a thousand different galaxies. Together, these form giant superclusters but not the only substructure of the Universe. Feel young?

here is part of the galaxies of the Local Group

According to the newspaper , most of the galaxies that make up — a network of superclusters of galaxies — there are small groups that are scattered across the cosmos. Researchers believe that the galaxies of the Local Group originated more than 13 billion years ago when the first accumulation of the substance has grown into protogalaxies. Less than a billion years after the Big Bang, when formed stars, the Local Group stretched for 600 000 light years. The fact that being close to each other, the galaxies at that time were United more often. It is possible that these mergers could create the milky Way from 100 or more protogalactic.

The Satellites of the milky Way — Large and Small Magellanic Cloud — are from us at a distance of 163 thousand light-years. It is a dwarf galaxy that the milky Way will absorb in the future. This is not surprising, since our galaxy is right now destroying and spheroidal dwarf galaxy Sagittarius. In addition, approximately 4 billion years the Andromeda Galaxy and the milky Way will collide resulting in formation of a new, large galaxy, which will eventually become a giant elliptical galaxy.

Large and Small Magellanic Clouds

Given the fact that the observations of astronomers is limited to the observable Universe, studying galaxies in the Local Group and nearest to her Virgo clusters allows scientists to see a microcosm — a kind of laboratory or a Universe. A substance that astronomers call dark matter accounts for 26% of all the material in , but no one knows what it is. Using a technique called gravitational lensing, astronomers have studied the halo of the milky Way and ruled out several suspected candidates. Similarly, scientists use the nearest galaxies to study where black holes are formed. Anyway, the evolution of galaxies and the star formation process, allows scientists to learn more not only about our own galaxy and about the Universe.

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