James Webb staring at Earendel, the farthest known star

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[EN VIDÉO] Understand the mission of the James Webb Space Telescope in one minute
The James Webb Space Telescope, a new pioneer in space observation, will be launched on December 18 from Kourou, Guyana. After a 29-day journey, you will arrive at the Lagrange point L2, in the opposite direction from the sun. Thanks to its larger mirror than the Hubble Mirror, of which it is considered a successor, JWST will be able to observe galaxies, planets, nebulae and stars to learn more about the history of the universe.

We have undoubtedly entered the era of the James Webb Space Telescope (JWST) and it promises to be even brighter than the one that opened thirty years ago with the Hubble Telescope.. In particular, we expect JWST to shed some light on what happened shortly after the end of Dark Ages Followed by the “Cosmic Renaissance”, also calleddawn cosmic, the era of reionization (EoR), when powerful light sources – whose source is not yet known for certain – began to re-ionize dramatically atoms Neutral formed in a few thousand years, about 380,000 years after the great explosion.

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 the great explosion. Before, in the beginning, no star 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 masses Solar. We are talking about these stars in terms of stars third peoplejust like a 3-month-old is older than a 1-month-old.

Approximately a third star population?

The The theory of evolution My astral tells us that these stars lived a million years at most, produced by nuclear structure Excellent for the first time inUniverse Observable cores are heavier than lithiumwhich will then disperse into the youth Universe Through the explosion in the form of a supernova. When you do this, they will modify the configuration of a file Clouds Where new stars can be born collapse 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 with Hubble telescope which 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 byastronomer 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 help gravity lensi.e. the effect of magnification (in this case by a factor of at least 1000) caused by the gravitational field of a galaxy cluster 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 Twitter.

Hubble broke all records for the farthest star ever observed

Article from Laurent Sacco Published on 03/04/2022

The Hubble Space Telescope He 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 NASA 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 ” morning star But, for us, it is above all a star observed when the universe was only 7% of its age, which means that Photons 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, astrophysicists benefit from Gravitational lens effect To a large distribution of mass for additional magnification this alone cannot do eye 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 newspaper temper natureAnd the We also learned that Earndale was a star with a mass at least 50 times the mass of the Sun, 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 Supernova SN II a very long time ago, leaving behind a compact star that must have been a neutron star or star stellar black hole.

For us, it still exists, and will certainly be studied in more detail in the near future with a telescope. James Webb.

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 of Gas Almost pure from the Big Bang, i.e. a mixture of hydrogen andhelium which is almost unchanged by the production of heavy cores, carbon andOxygen 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.

The Sun are 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 Ball groups 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

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