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Astronomers uncover a galaxy frozen in time for billions of years: ‘Fossil galaxies are just like the dinosaurs of the universe’

July 1, 2025
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Astronomers uncover a galaxy frozen in time for billions of years: ‘Fossil galaxies are just like the dinosaurs of the universe’
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Astronomers have found a distant galaxy that may be a “cosmic fossil” which has remained “frozen in time” for billions of years.

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Simply as dinosaur fossils right here on Earth are used to probe the evolution of life, this cosmic fossil within the type of the galaxy KiDS J0842+0059 could possibly be used to know cosmic evolution.

A cosmic fossil is a galaxy that has managed to stay unchanged by collisions and interactions with different galaxies. Meaning they’ll act as pristine time capsules to assist astronomers examine earlier galaxies.


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Current analysis carried out utilizing information from the Giant Binocular Telescope (LBT) has revealed that this galaxy has remained unchanged for round 7 billion years.

“Now we have found a galaxy that has been ‘completely preserved’ for billions of years, a real archaeological discover that tells us how the primary galaxies had been born and helps us perceive how the universe has developed to this present day,” workforce co-leader and Nationwide Institute for Astrophysics (INAF) researcher Crescenzo Dove mentioned in a press release.

“Fossil galaxies are just like the dinosaurs of the universe: learning them permits us to know through which environmental circumstances they shaped and the way probably the most huge galaxies we see right now developed.”

The KiDS are alright

KiDS J0842+0059, situated 3 billion light-years away from Earth, was found in 2018 by the KiDS (Kilo Diploma Survey).

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Photos of the galaxy offered by the Very Giant Telescope Survey Telescope (VST) allowed astronomers to measure the scale and mass of KiDS J0842+0059. These measurements had been perfected by the Very Giant Telescope (VLT) and its X-Shooter instrument.

This revealed that KiDS J0842+0059 has a stellar mass of round 100 billion occasions that of the solar, however is extra compact than comparable mass galaxies. It was additionally found that KiDS J0842+0059 has lacked star formation for a lot of its life. All this hinted towards it being a fossil galaxy.

The relic galaxy KiDS J0842+0059, observed with the VST as part of the KiDS survey (left) and with the Large Binocular Telescope (right).

The relic galaxy KiDS J0842+0059, noticed with the VST as a part of the KiDS survey (left) and with the Giant Binocular Telescope (proper). (Picture credit score: C. Tortora/INSPIRE/VST/ESO/LBT)

To take away uncertainties across the traits of KiDS J0842+0059, notably its measurement and construction, this workforce set about utilizing the adaptive optics system of the LBT to get sharper photos of this relic galaxy. This resulted in photos with ten occasions the element of the KiDS offered photos.

“Information from the LBT have allowed us to verify that KiDS J0842+0059 is certainly compact and due to this fact a real galaxy relic with a form just like NGC 1277 and the compact galaxies we observe within the early levels of the universe,” workforce member Chiara Spiniello, a researcher on the College of Oxford, mentioned. “That is the primary time that we now have been ready to do that with such high-resolution information for a galaxy relic so far-off.”

NGC 1277 is one other instance of a uncommon stunted galactic fossil, which is situated within the Perseus Cluster round 240 million light-years away, that means it’s a lot nearer to residence than KiDS J0842+0059.

This Hubble Space Telescope image shows the galaxy NGC 1277, which is unique in that it is considered a relic of what galaxies were like in the early universe. NGC 1277 is composed exclusively of aging stars that were born 10 billion years ago.

The relic galaxy NGC 1277 as seen by the Hubble Area Telescope. (Picture credit score: M. Beasley(Instituto de Astrofisica de Canarias)/NASA/ESA)

The truth that there are galaxies like NGC 1277 and KiDS J0842+0059 on the market signifies some galaxies can type quickly, keep compact and stay dormant for billions of years by dodging collisions with different galaxies.

“Finding out these cosmic fossils helps us reconstruct the formation historical past of the nuclei of right now’s huge galaxies, which — in contrast to relic galaxies — have undergone fusion processes, accreting matter proper round these first compact galaxies from which they originated,” Tortora mentioned. “With cutting-edge applied sciences corresponding to adaptive optics and the assist of telescopes such because the LBT, we are able to enhance our understanding of this sort of galaxy.

“Within the close to future, we’ll take a step ahead, aiming to seek for, verify, and examine new relic galaxies by means of the distinctive high quality and high-resolution information of the Euclid house telescope.”

The workforce’s analysis was printed within the Monthly Notices of the Royal Astronomical Society.



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Tags: AstronomersbillionsDinosaursdiscoverfossilfrozengalaxiesGalaxytimeUniverseyears
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