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Astronomers have seen a primordial time star They believe it to be the most “ancient” object in the universe.
A team led by Alexander Gee at the University of Chicago said the star, named SDSS J0715-7334, offers a glimpse of the first stars that emerged shortly after the explosion. big bang,
The star originates from a dwarf galaxy called the Large Magellanic Cloud, which is about 163,000 light-years away from the Milky Way. According to the researchers, it has since moved into the galaxy’s halo, making it a “galactic immigrant”.
What makes it so pristine is that it is not contaminated with elements heavier than hydrogen and helium.
It contains only 0.8 parts per million of heavy elements, making it about 20,000 times more pure than the Sun.
This composition means it is a likely candidate for one of the earliest stars in the universe, with astronomers previously theorizing that such stars had exploded long ago due to the lack of heavy elements.
Its existence suggests that some places in the universe have distinct environments that allow stars to cool without the need for elements like carbon.
“The first stars were formed from ancient gas, making them so massive that none are expected to survive today,” researchers led by Alexander Gee at the University of Chicago write in a paper.
“If their direct descendants were sufficiently low-mass stars, they would still exist today and would at best be recognizable due to their low metallicity (abundance of elements heavier than helium).
The least metallic star currently known is a star in the thick disk of the Milky Way… Here we present the discovery and detailed chemical analysis of the most metal-poor star ever found: the red giant star SDSS J0715-7334.
“The structure of this star is the most ancient of any known object in the universe.”
pre-print paperThe article, titled ‘A nearly ancient star from the Large Magellanic Cloud’, can be found on arXiv.