. In particular, we expect JWST to shed some light on what happened shortly after the end of Followed by the “Cosmic Renaissance”, also called cosmic, the era of reionization (EoR), when powerful light sources – whose source is not yet known for certain – began to re-ionize dramatically Neutral formed in a few thousand years, about 380,000 years after .
In this video, astronomer Michael Thaler explains to us what the cosmic dawn is, the period of reionization, which will make it possible to study James Webb and not only him. For a fairly accurate French translation, click the white rectangle at the bottom right. The English translation should then appear. Then click on the nut to the right of the rectangle, then click on “Subtitles” and finally on “Translate automatically”. Choose “French”. © NASA Goddard Space Flight Center
The exact date of the beginning of reionization is debated, and all that can be said is that it occurred between 100 and 400 million years after. Before, in the beginning, no They existed until now, but during EoR there was reason to believe that the ones that formed and sparkled were pretty massive, at least 50 to 100 million Solar. We are talking about these in terms of stars just like a 3-month-old is older than a 1-month-old.
Approximately a third star population?
TheMy astral tells us that these stars lived a million years at most, produced by Excellent for the first time in Observable cores are heavier than which will then disperse into the youth Through the explosion in the form of a supernova. When you do this, they will modify the configuration of a file Where new stars can be born Gravity, and later favored the appearance of stars of less mass, so that after more than a billion years after the Big Bang, it became impossible to observe stars with all the properties of those of the third group.
Astrological interpretations of Michael Thaler for Population 3 Star and Earendel. © Space.com
However, it is possible that the star at a record distance was recently discovered withwhich Futura discusses in some detail in the previous article below, Earendel, is either one of the last stars of the third group born less than a billion years after the Big Bang (or at least very similar to it), or more likely, as explained by Michel Thaler, unfortunately in English in the video above, is an example of stars with little difference in composition and characteristics, born immediately after them.
Remember, she was only kicked out with helpi.e. the effect of magnification (in this case by a factor of at least 1000) caused by the gravitational field of a It interferes between the Earendel and the Hubble, deflecting the rays of light like a magnifying glass.
Calculations then indicated that Earendel must contain at least 50 solar masses and that it was observed when the universe was only about 900 million years old.
Recently, the first photo was published showing Earendel.
Hubble broke all records for the farthest star ever observed
Article fromPublished on 03/04/2022
TheHe just showed that we can always rely on it to determine a record distance for stars in the distant universe, before the James Webb Telescope came into operation. The It just announced that it has photographed the farthest known star yet, where it was 12.9 billion years ago.
her name erendell One might think that it is a difference in the nameErndelone of the elven characters created by the British writer J.R.R. Tolkien and mentioned in the Lord of the Rings. NASA explains, however, that it is an old English term meaning ”But, for us, it is above all a star observed when the universe was only 7% of its age, which means that collected by the Hubble telescope took 12.9 billion years to reach.
Farthest known star so far
It is actually the most distant star discovered so far and like some of the distant galaxies that broke distance records thanks to the Hubble telescope,benefit from To a large distribution of mass for additional magnification this alone cannot do in the orbit of the noosphere. In this case, it was the galaxy cluster WHL0137-08 that broke the previous record for a single star. In fact, Hubble was then able to consider a time when the observable universe was only 4 billion years old.
Video taken from the documentary odyssey of light In a vacuum, light usually travels in a straight line. But in a space distorted by a huge celestial body, such as a galaxy, this path is deflected! Thus, a light source behind a galaxy has an apparent location that differs from its true location: this is a phenomenon The Mirage of Gravity © CEA, Anemia
The discovery was published today Across Article in the newspaperAnd the , making it one of the most popular websites. However, the theory of stellar structure and evolution also tells us that this type of star can only live for a few million years at most. It definitely exploded in SN II a very long time ago, leaving behind a compact star that must have been a neutron star or star .
For us, it still exists, and will certainly be studied in more detail in the near future with a telescope..
Hubble broke a new record, as this video demonstrates. For a fairly accurate French translation, click the white rectangle at the bottom right. The English translation should then appear. Then click on the nut to the right of the rectangle, then click on “Subtitles” and finally on “Translate automatically”. Choose “French”. © NASA’s Goddard Space Flight Center
Earendel, a Population Type III star?
The data that James-Webb will collect will indeed be used to clarify the nature and properties of the Earendel because even if the gravitational lensing produced by the group of galaxies has already enabled us to estimate some of them, such as temperature, mass and their properties. Radius, there are still doubts about it. In fact, Earendel could be a double star for example.
The most interesting perspective would be that we are in front of a star made up ofAlmost pure from the Big Bang, i.e. a mixture of hydrogen and which is almost unchanged by the production of heavy cores, carbon and In particular, in the first stars. It is believed that these were different, and significantly larger than the stars that formed in galaxies billions of years later. Thus, Earndel could look a lot like these primitives that are said to belong to the third type of population, because they are very old.
Theare part of the Population Type I stars and stars older than 10 billion years, not very massive and therefore long-lived, which are found in The stellar halos of galaxies are part of Type II groups.
Astrophysicist Roger Windhurst tells us about his discovery of the Earendel and Star Clusters. For a fairly accurate French translation, click the white rectangle at the bottom right. The English translation should then appear. Then click on the nut to the right of the rectangle, then click on “Subtitles” and finally on “Translate automatically”. Choose “French”. © ASU School of Earth and Space Exploration