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James Webb telescope finds historic galaxy bigger than our Milky Manner, and it is threatening to upend cosmology

February 25, 2024
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James Webb telescope finds historic galaxy bigger than our Milky Manner, and it is threatening to upend cosmology
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The James Webb Area Telescope (JWST) has discovered a galaxy within the early universe that is so huge, it should not exist, posing a “important problem” to the usual mannequin of cosmology, in accordance with the research authors.

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The galaxy, referred to as ZF-UDS-7329, incorporates extra stars than the Milky Manner, regardless of having fashioned solely 800 million years into the universe’s 13.8 billion-year life span. This implies they had been by some means born with out dark matter seeding their formation, opposite to what the usual mannequin of galaxy formation suggests.

How this might have occurred is unclear, however very like earlier JWST discoveries of other inexplicably massive galaxies in the early universe, it threatens to upend our understanding of how the primary matter within the universe fashioned, or probably even the usual mannequin of cosmology itself. The researchers revealed their findings Feb. 14 within the journal Nature.

Associated: Proper earlier than exploding, this star puffed out a solar’s value of mass

“Having these extraordinarily huge galaxies so early within the universe is posing important challenges to our commonplace mannequin of cosmology,” research co-author Claudia Lagos, an affiliate professor of astronomy on the Worldwide Centre for Radio Astronomy Analysis, said in a statement. It’s because huge darkish matter constructions, that are regarded as vital parts for holding early galaxies collectively, didn’t but have time to type this early within the universe, Lagos added.

Gentle travels at a hard and fast pace by the vacuum of area, so the deeper we glance into the universe, the extra distant mild we intercept and the additional again in time we see. That is what enabled the researchers to make use of JWST to identify ZF-UDS-7329 roughly 11.5 billion years previously.

By finding out the spectra of sunshine coming from the celebs of this extraordinarily distant galaxy, the researchers discovered that the celebs had been born 1.5 billion years previous to that statement, or roughly 13 billion years in the past.

Astronomers aren’t sure when the very first globules of stars started to clump into the galaxies we see at this time, however cosmologists beforehand estimated that the method started slowly throughout the first few hundred million years after the Large Bang.

Present theories recommend that halos of darkish matter (a mysterious and invisible substance believed to make up 25% of the current universe) mixed with gasoline to type the primary seedlings of galaxies. After 1 billion to 2 billion years of the universe’s life, the early protogalaxies then reached adolescence, forming into dwarf galaxies that started devouring each other to develop into ones like our personal.

However the brand new discovery has confounded this view: Not solely did the galaxy crystallize with out sufficient constructed up darkish matter to seed it, however not lengthy after a sudden burst of star formation, the galaxy abruptly turned quiescent — that means its star formation ceased.

“This pushes the boundaries of our present understanding of how galaxies type and evolve,” research co-author Themiya Nanayakkara, an astronomer on the Swinburne College of Know-how in Australia, stated within the assertion. “The important thing query now’s how they type so quick very early within the universe, and what mysterious mechanisms result in stopping them forming stars abruptly when the remainder of the universe is doing so.”

The researchers’ subsequent steps might be to seek for extra galaxies like this. In the event that they discover any, it might critically contradict prior concepts of how galaxies fashioned, they stated.



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