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Peculiar galaxy appears to comprise surprisingly pristine stars

July 26, 2025
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Peculiar galaxy appears to comprise surprisingly pristine stars
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Abell 2744, the galaxy cluster the place AMORE6 was noticed

NASA, ESA, Jennifer Lotz, Matt Mountain, Anton M. Koekemoer, HFF Workforce (STScI)

A galaxy marooned in an empty area of the universe seems to be unexpectedly stuffed with primordial stars. This might give astronomers their first glimpse of a type of stellar object thought to have shaped shortly after the universe’s first moments and which has by no means been straight noticed.

Regardless of having the ability to peer again to close the start of the universe with the James Webb House Telescope (JWST), astronomers have struggled to definitively discover proof of the primary stars. Often called inhabitants III stars, these are large balls of largely hydrogen that may have shaped within the early universe. Being the primary stars, they’d have nearly not one of the heavier parts which can be produced when stars die and explode.

Whereas there have been hints of this type of star, it has been troublesome to search out conclusive proof of them within the early universe, as galaxies look like contaminated with heavier parts comparatively quickly after the massive bang, in only a few hundred million years.

Now, Takahiro Morishita on the California Institute of Know-how and his colleagues have discovered a galaxy made up nearly completely of hydrogen, an indication of inhabitants III stars. However the galaxy exists a lot later than anticipated for one containing such stars, round a billion years after the start of the universe.

Known as AMORE6, it was initially noticed in a galaxy cluster generally known as Abell2744. Morishita and his workforce then measured the sunshine coming from AMORE6 with JWST and located {that a} frequent oxygen ion was completely absent. Which means the galaxy can have not more than 0.2 per cent of the oxygen present in our personal solar, implying it’s significantly uncontaminated by heavier parts.

Because the universe grows older, it turns into more and more unlikely to comprise pristine galaxies of this type. Within the JWST photographs, AMORE6 seems to be comparatively remoted, which would be the purpose why it’s so pristine, Morishita suggests. “That isolation signifies that this galaxy is likely to be in an space that didn’t have sufficient gasoline to set off star formation earlier. That signifies that this galaxy is likely to be a late bloomer in a single sense,” he says.

“If the outcomes are confirmed, it’s actually exceptional, as a result of sometimes we don’t anticipate finding such pristine galaxy environments so late within the improvement of the universe,” says Fabio Pacucci on the Harvard-Smithsonian Middle for Astrophysics in Massachusetts.

It additionally has implications for our skill to watch “direct collapse” black holes, which type from large clouds of pristine gasoline reasonably than the standard route of an imploding star. Though these have been predicted by astronomers, they’ve by no means been conclusively seen forming, partially as a result of pristine gasoline was solely considered accessible for this maybe as much as 100 million years after the massive bang, which is just too early for us to detect them. But when pristine gasoline can survive for much longer, then this would possibly dramatically enhance our probabilities of seeing one, says Pacucci.

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

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