Strictly speaking, are we living in the corpse of a galaxy?
Our Milky Way is once dead and resurrected, we live in a “zombie” Milky Way. This is what the Japanese scientist has just concluded, after analyzing the chemical composition of the stars that exist in our Milky Way.
Most of the stars in the galaxy we live in can be divided into two completely different types of chemical makeup.
The first group contains substances that are abundant in the α (alpha) element group, including oxygen, megie, silicon, sulfur, calcium, and titanium.
The second group contains substances that are less common in the group of α elements, which are more commonly found in iron. The two separate groups reported that something unusual had happened during the formation of the Milky Way. But what is the cosmic event and what is the mechanism that creates it, we do not yet have a solid basis.
Astronomer Masafumi Noguchi of Tohoku University believes that his computer simulation model gives the results of the above question. The two groups of stars show a different star formation, in which there is a “silence” in which no stars appear.
Based on the theory of cold currents in the Universe, first sketched in 2006, Professor Noguchi created a model to simulate milestones in the Milky Way over a period of 10 billion years.
Initially, the cold flow hypothesis created very large galaxies, suggesting that large galaxies will have two distinct phases of star formation. The two phases of star formation are chemically opposed, and Professor Noguchi believes our banking band is the same.
The chemical composition of stars is highly dependent on the gas from which they are formed. In the early Universe, the elements – heavy metals, for example – have not yet appeared, they only formed when stars formed, only appearing when a supernova explosion took place.
Based on the model built by Noguchi, during the first star formation, the galaxy sucked in cold gas from the outside. This gas forms the first generation of stars.
After about 10 million years – very short compared to the lifespan of the universe, the first-generation star dies in a supernova explosion. The alpha elemental shoots across the galaxy, forming new stars. But also according to this diagram, about 3 billion years after the above events, everything has gone in the wrong direction, a fatal direction.
“When shock waves appeared, heating the gas about 7 billion years ago, the gas stopped flowing in the galaxy and the stars were no longer appearing,” said the study’s statement, released by Tohoku University itself.
Ambiguous for 2 billion years, a series of second supernova explosions appeared, lasting longer than the previous time. These types of explosions usually occur after a star is around 1 billion years old.
They produce iron and spit everywhere. As the gas cools over time, stars continue to form around 5 billion years ago, and newer-generation stars have significantly higher percentages of iron than before. Our Sun is a second generation star, it is 4.6 billion years old so far.
Professor Noguchi’s research is based on recent studies involving the closest galaxy and the same size as ours, the Andromeda Galaxy. In 2017, a team of researchers published a scientific report showing that in the history of Andromeda, there were two stages of star formation and a “silence” between them.
If the model set up by Professor Noguchi is correct, all the galaxy models we have ever needed to be reviewed. Perhaps the name of the Milky Way should be changed to something better with its “still and over and over” life.
