The Milky Way has died once, we live in its second

Strictly speaking, are we living in the body of a galaxy?

Our Milky Way died once and revived , we live in a "zombie" Milky Way . That's what Japanese learners have concluded, after analyzing the chemical composition of stars that exist in our Milky Way.

The majority of stars in the galaxy we live in can be divided into two completely different types of chemical composition. The first group contains many substances in the element group α (alpha), including oxygen, megie, silicon, sulfur, calcium and titanium. The second group contains substances found less in the element α group, often found in iron. Two separate groups show that something unusual happened during the formation of the Milky Way. But what is a cosmic event, and what is the mechanism that makes it, we have no firm basis to assert.

The chemical composition of stars relies heavily on the gas from which they form.

Astronomer Masafumi Noguchi from Tohoku University believes that his computer simulation model gives the result for this question. Two star groups show two different star-forming processes, alternating between a "silence" , not a single star appears.

Based on the hypothesis of the development of the cold flow in the Universe , for the first time in 2006, Professor Noguchi created a model to simulate the Milky Way development milestones over a period of 10 billion years. . Initially, the cold-flow hypothesis created very large galaxies, showing that large galaxies would have two distinct stages of star formation. Two stages of making stars with opposite chemistry, Professor Noguchi believes that our Bank Strip is the same.

The chemical composition of stars relies heavily on the gas from which they form. During the early days of the Convergence, elements - such as heavy metals - have not yet appeared, they form only when stars have formed, appearing only when a supernova explosion takes place.

Based on the built-up Noguchi model , during the first star-forming phase, the galaxy draws in gas from the outside. This gas formed the first generation of stars.

After about 10 million years - very short when compared to the life of the universe, why the first generation died with a supernova explosion. Element alpha shoots out all galaxies, forming new stars. But also following this model, about 3 billion years after these events, everything goes in a bad direction, a dimension of death.

In the history of Andromeda, there are two stages of star formation and the alternating is a "silence".

"When the shockwave appeared, heated the gas about 7 billion years ago, the gas stopped flowing into the galaxy and stars no longer appeared," the study said, published by Tohoku University itself. Confused for 2 billion years, the second series of supernova explosions appeared, lasting longer than the last time. These explosions often appear after a star reaches 1 billion years old.

They create iron and spray out everywhere. When gas cools over time, why is it still forming about 5 billion years ago and new generation stars with a higher percentage of iron than before. Our Sun is a 2nd generation star, it has "aged" 4.6 billion years old so far.

Professor Noguchi's research is based on new researches involving the nearest galaxy and the same size as our Milky Way, Andromeda galaxy. In 2017, a team of researchers published scientific reports showing in the history of Andromeda, there are two stages of star formation and the alternating is a "silence".

If the model that Professor Noguchi created is correct, all the models of galaxies we have ever had need to be reconsidered. Perhaps the name of the Milky Way must be changed to something more true for its "resurrection" nature.

The study was published in Nature.