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August 7, 2019
In a study published in the journal "Science", a research team from the University of Warsaw announced that it was able to achieve a realistic three-dimensional design of our galaxy, the Milky Way, where it appears under its usual form in the form of a flat disk resembling a dish.
According to the study published on August 1, the edges of our galaxy are not as straight as previously thought, but rather twisted, one end being bent up and the other down .
Stars twinkling
The research team was able to design this shape for our galaxy by studying about 2,500 stars in the "Cepheid variable" category and examining the distances between us and each of these stars and then putting the results into a computer simulation. The research team found that our galaxy took this curved shape.
The Cepheid variant is the most important and well known pulsar. The variable stars of Cepheids are two hundred times larger than our Sun. They are very hot and emit matter, gases and stellar winds in cycles.
Changing stars are a special type of stars that shine in the sky and diminish continuously, can be regular and irregular. The ancients saw some of them and imagined that they were related to demons that "flash" their eyes on humans on Earth, because of the change in brightness.
But we now know that this variation in brightness occurs for various reasons, including the nature of the star itself, where it swells and shrinks, and the variables of the Cepheid are one of the most Famous evolving because their brightness in the sky changes during a regular period.
The popularity of the Céphéides variants is due to the fact that there is a precise physical relationship between the number of times its pulse and the distance that separates them. It was thus possible to observe each star for a long time only the Warsaw research team to determine the distance that separated them from the Earth.
Curved galaxy
But it is not so easy, these stars being very distant, it was necessary to use a relatively modern observatory, the observatory of the optical gravitational objective (Ojel), the most precise in this range, so that it This is the driest and darkest region in the world. Set up observatories.
Ojel is able to detect and clbadify twice as many known stars in other telescopes as possible, which has helped the Warsaw University team to create a galaxy model as precise as possible to date.
This is not the first time that the edges of our galaxy are twisted. In February, a team of researchers from the National Academy of Sciences of China announced similar results, which justifies the conviction that the gravity of our galaxy is weakening, offering him the possibility of more flexible movements.
Scientists want to determine the exact shape of the Milky Way, our galaxy, because it's just the galaxy we live in. His precise understanding gives researchers in this category a better chance of understanding the structure of other galaxies, and thus of the entire universe. (Al Jazeera Net)
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