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The Milky Way is a distorted space



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  Milky way galaxy art, one side of the galaxy inclined up, and one side sloping down

View larger. | The concept of the artist – which is said to be "slightly exaggerated" – to the true form of our distorted Milky Way galaxy. Image by Xiaodian Chen (NAO, CAS) / Science in Public.

We believe spiral galaxies are flat. You often hear the disk of our galaxy being described as "flat as a pancake". The great spiral galaxy next door ̵

1; the Andromeda galaxy – looks flat through a telescope. But nature can be complex and this week (February 4, 2019) astronomers made a surprising message. They said our home galaxy, the Milky Way, is not flat. Astronomers from Macquarie University and the Chinese Academy of Sciences used 1339 classic cespheid variable stars for this study. These are stars that brighten and darken in a way that changes according to real luminous stars. So these stars are used as classic distance indicators. Astronomers use data for these stars from the wide-ranging infrared researcher (WISE). The work has made them create a 3D map of what they say is the "true" form of our Milky Way. A document describing this study was published on February 4 in the reviewed journal Nature Astronomy . The astronomers say:

They found that the disk of the Milky Way stars became more distorted and distorted as the stars from the center of the galaxy were farther away. to be somehow "special". But – from what is known today – its distorted shape gives it a specialty, though not a uniqueness. Astronomers have watched a dozen other galaxies displaying similar twisted spiral patterns in their outer regions.

So our reversals in the Milky Way are rare, but they are not seen elsewhere in the universe.

  View from the perspective of an elegant flat S-galaxy with visible clouds of dust.

Our Milky Way is not the only distorted galaxy. This galaxy, labeled with ESO 510-G13, is a twisted spiral galaxy. Like the Milky Way, it has a pronounced base in its gas disc and a lesser-known disc at its core. Photo by NASA / Space Telescope Science Institute

Establishing the shape of the Milky Way was not easy, astronomers say. Their statement explains:

The attempt to determine the true shape of our galaxy is like staying in Sydney's garden and trying to determine the shape of Australia. But over the last 50 years there have been signs that the hydrogen clouds in the Milky Way are distorted. The new map shows that the curved disk of the Milky Way also contains young stars.

  The red and blue points of a rotating 3D graph.

Animation of the three-dimensional map of cecidic variable stars. in our Milky Way, revealing its distorted form. For more information on this image, see the illustration below.

In their statement, it is also said:

From a long distance, our spiral galaxy will look like a thin disk of stars that travels once a few hundred million years around its central area where hundreds of billions of stars provide the gravitational "glue "to keep it together.

But this attraction of gravity is much weaker in the far outer disk of the galaxy. There, the hydrogen atoms, which make up the bulk of the Milky Way Gas Disc, are no longer limited to a thin plane, but instead give the disk S-like or distorted appearance. Once they have developed the first accurate three-dimensional picture of the Milky Way to its far-flung regions.

All this raises a question. If, as these scientists think, the massive inner disk of our galaxy is what probably causes the torque that creates the curved spiral pattern of the Milky Way – why are most other spiral galaxies not so distorted and distorted?

Why do not we see many galaxies distorted in this way?

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<img class = "size-full wp-image-305949" src = "http://en.es-static.us/upl/2019/02/3D-map-of-classical-Cepheid-variable- stars-e1549387002181.jpg 3 D chart of the galaxy's outline with blue and red dots points in the Sun. (shown as a large orange symbol) Astronomers at Macquarie University and the Chinese Academy of Sciences used 1339 classical caffeine variable stars to produce a 3D map of our galaxy.This is the first accurate 3D map to reveal the shape of our galaxy as twisted and twisted

Source: Intuitive 3D map of the precession of the galactic foundation traced by the classical cepheids

Through Science in Society

  Deborah Bird


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