The state-of-the-art James Webb Space Telescope has just set a new record by identifying the 4 oldest known galaxies in the universe, born just 300 million years after the Big Bang.
The new data actually helps scientists look directly into the past, because for galaxies 13.5 billion light years away to appear, light not only has to travel that distance, but also put 13.5 billion light years away. years for the journey.
In other words, this image Photos from 13.5 billion years ago, literally across space and timeoffering a realistic vision of the dawn of the universe.
Images transmitted to Earth 13.5 billion years ago reveal 4 ancient galaxies
Images transmitted to Earth 13.5 billion years ago reveal 4 ancient galaxies – (Photo: NATURE).
The new research was carried out by an international team of scientists from the UK, Italy, Netherlands, USA, Germany and Australia, led by Dr Emma Curtis-Lake from the Center for astrophysics at the University of Hertfordshire (UK). Dr Stefano Carniani from the Scuola Normale Superiore di Pisa University (Italy).
According to Live Science, what’s different from some previous studies? “they say it’s a galaxy” with almost the same age, also according to James Webb’s data, this new study confirms these are indeed ancient galaxies and are unlikely to be disguised objects.
In addition, they also analyzed signs of how these galaxies work. They exist in periods “reionization”, when the first stars were created.
The paper published in the journal Nature says that after confirming the ages of the galaxies, the researchers measured the sizes of the stars and found that they were smaller than today’s stars.
But what is surprising is that the star formation process takes place with a speed and rapidity that was not expected in such a primitive world.
These galaxies also do not appear to contain particularly complex elements, suggesting that their stars have not had time to create heavy elements and are made only of hydrogen and helium atoms from the primitive space.
This also coincides with theories and models of the early universe with a simple chemical composition.
The vigorous star formation also suggests that these galaxies grew very quickly, meaning the early universe had a more dynamic start than we imagined.
These ancient galaxies and their stars can be considered the “ancestors” of what exists today, notably the Milky Way or, to a lesser extent, our Earth.
Single stars in early galaxies are also of poor composition and often short-lived, but their lifetimes – including fusion reactions in the core, what happens when they die and then explode as supernovas – are sufficient to accomplish the mission of a “factory” synthesizing heavier objects. elements.
As a result, the deaths of these stars – and perhaps the four galaxies above are also long dead – provide richer material for the new class of galaxies and stars.
The process that occurred continuously over many generations created a universe with a rich chemical composition like today’s, much like how humanity diversified its genome and expanded to new levels during the process of evolution of chemistry.
James Webb is today the most advanced telescope in the world, developed and operated by NASA, in collaboration with ESA and CSA (European and Canadian space agencies). Its main mission is to observe the cosmic dawn in search of ancient objects.
Article source: NLD
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The cutting-edge James Webb space telescope has just set a new record by identifying the four oldest known galaxies in the universe, born just after the explosion…