2024-02-23 16:04:00
the essential Thanks to the instruments of the James Webb telescope, astronomers have made the incredible discovery of a galaxy which should not exist, whether due to its age, its size or the dark matter it contains. Explanations.
A gigantic galaxy that defies known physical theories… This is what a study carried out by an international research team led by Karl Glazebrook of Swinburne University of Technology in Melbourne reveals, and published in the journal Nature on February 15, 2024.
Age: 13 billion years
If the galaxy poetically named ZF-UDS-7329 appears red in the image, it is because it is very far from Earth – and therefore very old. According to observations made, the stars that compose it appeared approximately 11.5 billion years ago, which supposes that the whole was formed 13 billion years ago.
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What amazes scientists is that until now, they thought that there was not enough dark matter (invisible matter present in very large quantities within galaxies) in the Universe at this time. time to form such a monster.
An exciting discovery
For astronomers, the Big Bang took place 13.8 billion years ago. In the early ages of the Universe, mass accumulated little by little to form small clusters – dwarf galaxies – which, millions of years after millions of years, would have grouped together to form the immense structures that the we observe today.
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Galaxies, these “bricks of the universe”
No computer model predicted the existence of such a collection, because the concentration of dark matter should not have been sufficient, just 800 million years after the Big Bang. This is one more mystery that scientists must now clarify, to better understand the origin of the formation of galaxies.
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