Sunday , August 14 2022

A new river star discovered fills most of the sky on the southern night


A billion years ago, a star star nursery made around 4000 stars. Usually, this newborn cluster would have been removed from the galaxy's violent forces and discharged through the Milky Way.

Instead, they produce enough severity between them to catch with each other – and form an anxiety stream, or a river of stars.

What's relevant to Australia – and people living elsewhere in the Southern Hemisphere – this river covers most of the air on the southern night, flowing with each other as one strong body.

Under our noses

And although it has been streaming underground Earth as long as there are people – and it is relatively close to the solar system – until just a few weeks ago, we do not know what we were in it broadcasting.

Researchers from the University of Vienna used data from the European Space Agency satellite Gaia to make their discovery, which they described as "astonishingly near the Sun" in 100 parsecs or 326 light years.

Such a bright star nursery is 4000 stars that travel together as a stream. Photo: NASA / JPL

The stream itself four times a time – it would take 1304 light years to travel from one end to another. So it's huge.

João Alves is a massive astrophysics teacher at the University of Vienna, and co-author of the research paper that includes the findings of the astronomy published in Astronomy and Astrophysics.

In a statement prepared by the magazine, he said: "The identification of adjoining disk streams is like looking for the proverbial needle in hay.

"Serpentists have been looking at this new stream for a long time, and thus, since it covers most of the air at night, but it only now realizes that it is there, and it's # 39 ; n huge, and stunning near the Sun. "

Serpentist Dream

Dr Alves said that finding such a stream "close to home is very useful, it means that they are not too short or too unclear to have a further detailed examination, as astronomers are dreaming ".

The scientists used Gaia's data to measure the 3D motion of stars in space.

As they surveyed the distribution of adjacent stars moving together, they were drawn to a specific group that was not known and unintentionally – and that "showed exactly the expected features of a cluster of stars born with each other but were pulled back "by the Gravel Trail gravity field.

"Most star clusters in the Galactic disk spread rapidly after they are born because they do not contain enough stars to create a deep gravity potential well, or in other words, they do not have Steam Meingast, the author's leader of the paper, said in a ready statement.

"Even in the surrounding sun neighborhood, however, some clusters with a massive mass mass are still bound for many hundreds of years. So, in principle, it should be similar remains to numbers, clusters or societies Similar to streams can also be part of the Llaethog Road. "

Above the most known star clusters

In other words, the behavior of the Llaethog Way envisaged the existence of the most unhealthy "more powerful" than the most known clusters in the nearby solar neighborhood ".

At one billion years old, the cluster has completed four full orbit around the Galaxy, enough time to drag into the stream-like structure due to gravitational interaction with & # 39 ; the Llaethog Road disk.

According to Astronomy and Astrophysics, star stars can be used as a valuable severity seller to measure the mass of the Galaxy. It also opens a path to tell us how galaxies are starred, testing the gravity field of the Milky Way, and, due to its proximity, becomes a "great target for planet discovery trips".

Professor Daniel Zucker Contact is a serpentist and researcher with Macquarie University. It is part of an Australian-led astronomer group that works with European co-operators on a project called the GALAH survey, which has decoded the "DNA" of more than 340,000 stars. the Milky Way, which they hope will help them find Sisters and Sisters – the stars born in the same cosmic nursery.

Dr Zucker said finding out the alien flows were so close to our solar system – and it has heavy elements that are similar to those in our Sun – which could help solve the puzzle.

"We believe that the stars form in clusters and over time they are dismissing through the Milky Way," he said.

"Stars in the star stream (recently discovered) are relatively young. They could be younger than a billion years … They could tell us how our Sun was formed but also what happened to siblings our Sun. Where are they now? "

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