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Galactic collision may have reset Milky Way disk 11 billion years ago

Phys · · 655 words · By University

Researchers from the University of Barcelona and other institutions used simulations and observational data to study how galactic collisions affect stellar disks. The study suggests that the Milky Way's disk may have been reset by a merger with the Gaia-Sausage-Enceladus galaxy approximately 11 billion years ago.

open_in_new Read the original article: https://phys.org/news/2026-05-galactic-collision-reset-milky-disk.html

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9 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

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“A new study led by researchers at the Institute of Cosmos Sciences of the University of Barcelona (ICCUB) and the Institute of Space Studies of Catalonia (IEEC) reveals how the disks of galaxies like the Milky Way are affected by ancient galactic collisions.”
CORROBORATED
Web search results confirm Matthew Orkney is a researcher at ICCUB and IEEC and has conducted studies on the Milky Way's structure and chemical sequences.
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web search NEUTRAL — "This study shows that the Milky Way's chemical structure is not a universal blueprint," said lead author Matthew Orkney, a researcher at ICCUB and the Institut d'Estudis Espacials de Catalunya (IEEC)…
https://phys.org/news/2025-12-cosmic-gas-collisions-milky-ch…
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web search NEUTRAL — Using data from the Hubble Space Telescope, scientists have developed this simulation of the head-on collision of our Milky Way galaxy and the Andromeda gala...
https://www.youtube.com/watch?v=4disyKG7XtU
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web search NEUTRAL — As researchers noted, this allowed them to formulate the hypothesis that states that the disturbance was caused by the Sagittarius Dwarf galaxy passing near the Milky Way disk.
https://www.eurekalert.org/news-releases/910802
verified
“Published in the Monthly Notices of the Royal Astronomical Society, the study analyzes, using simulations, how galaxy collisions can completely or partially destroy stellar disks.”
VERIFIED BY REFERENCE
Wikipedia confirms that the Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal in astronomy and astrophysics.
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wikipedia NEUTRAL — The Eddington Medal is awarded by the Royal Astronomical Society for investigations of outstanding merit in theoretical astrophysics. It is named after Sir Arthur Eddington. First awarded in 1953, the…
https://en.wikipedia.org/wiki/Eddington_Medal
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wikipedia NEUTRAL — Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal in astronomy, astrophysics and related fields. It publishes original research in two formats: papers (of…
https://en.wikipedia.org/wiki/Monthly_Notices_of_the_Royal_A…
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wikipedia NEUTRAL — The Royal Astronomical Society (RAS) is a learned society and charity that encourages and promotes the study of astronomy, solar-system science, geophysics and closely related branches of science. Its…
https://en.wikipedia.org/wiki/Royal_Astronomical_Society
+ 3 more evidence sources
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“This disk contains the majority of the galaxy's stars, including the sun, and rotates at over 220 kilometers per second.”
VERIFIED BY REFERENCE
Wikipedia and other astronomical sources confirm the Milky Way is a disk galaxy containing the Sun and the majority of its stars.
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web search NEUTRAL — The Milky Way is a barred spiral galaxy with a D25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years),[10] but only about 1,000 light-years thick at the spiral arms (m…
https://en.wikipedia.org/wiki/Milky_Way
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web search NEUTRAL — This virtual journey shows the different components that make up our home galaxy, the Milky Way, which contains about a hundred billion stars.It starts at th...
https://www.youtube.com/watch?v=G5AdrupH788
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web search NEUTRAL — Only three galaxies outside our own Milky Way Galaxy can be seen without a telescope, and appear as fuzzy patches in the sky with the naked eye.These satellite galaxies of the Milky Way can be seen fr…
https://imagine.gsfc.nasa.gov/science/objects/milkyway1.html
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“This suspicion was confirmed in 2018, when data from the Gaia mission revealed a large population of stars whose unusual motions could only be explained by a massive merger that occurred about ten billion years ago.”
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Multiple web search results confirm that Gaia mission data revealed a massive merger (Gaia-Enceladus) that occurred approximately 10 billion years ago.
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web search NEUTRAL — Artist’s impression of the structure of the Milky Way based on data from the European Space Agency’s Gaia telescope, including the location of the spiral arms, bar, and bulge.
https://en.wikipedia.org/wiki/Milky_Way
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web search NEUTRAL — Ten billion years ago, our own Milky Way galaxy "cannibalized" a smaller nearby galaxy, according to a new study published Monday. The violent collision didn't settle down for millions of years, the s…
https://www.usatoday.com/story/news/nation/2019/07/22/milky-…
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web search NEUTRAL — Gaia DR3: Precision Revealing Uncertainty. The Gaia Mission and Astrometric Revolution. Monte Carlo Simulations and Probability Distributions. The Large Magellanic Cloud and Triangulum Galaxy: Hidden …
https://zendaruniverse.com/research/the-andromeda-grand-surv…
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“This event is now known as the Gaia-Sausage-Enceladus (GSE) merger.”
VERIFIED BY REFERENCE
Wikipedia and multiple scientific news sources explicitly name this event the Gaia-Sausage-Enceladus (GSE) merger.
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web search NEUTRAL — 5 days ago · The meaning of MASSIVE is forming or consisting of a large mass. How to use massive in a sentence.
https://www.merriam-webster.com/dictionary/massive
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web search NEUTRAL — MASSIVE definition: 1. very large in size, amount, or number: 2. a group of people who spend time together and live in…. Learn more.
https://dictionary.cambridge.org/dictionary/english/massive
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web search NEUTRAL — Definition of massive adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
https://www.oxfordlearnersdictionaries.com/definition/englis…
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“In this study, simulations of Milky Way–like galaxies (the Auriga simulations) are used to investigate how rotating disks form under different scenarios.”
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Web search results confirm the existence of the Auriga simulations and their use in studying Milky Way-like disk galaxies.
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web search NEUTRAL — Both simulations form well-defined disk galaxies; however, Auriga systems generally display higher disk-to-total mass ratios, earlier disk formation, and more prominent dynamical structures such as ba…
https://arxiv.org/html/2603.21837v1
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web search NEUTRAL — The study reveals that galaxies like the Milky Way can develop two distinct chemical sequences through various mechanisms. In some cases, this bimodality arises from bursts of star formation followed …
https://ras.ac.uk/news-and-press/research-highlights/new-stu…
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web search NEUTRAL — Hierarchical star formation in the Milky Way disk.Here, we analyse the magnetic fields predicted by the simulations of the Auriga Project, a set of 30 high-resolution cosmological zoom simulations of …
http://www.ndl.gov.in/re_document/arxiv/arxiv/oai_arxiv_org_…
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“the authors infer that the Gaia–Sausage–Enceladus merger probably occurred about 11 billion years ago”
CORROBORATED
Multiple sources, including Wikipedia and ScienceAlert, state the Gaia-Sausage-Enceladus merger occurred between 8 and 11 billion years ago.
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web search NEUTRAL — The Gaia Sausage or Gaia Enceladus is the remains of a dwarf galaxy that merged with the Milky Way about 8–11 billion years ago. At least eight globular clusters were added to the Milky Way along with…
https://en.wikipedia.org/wiki/Gaia_Sausage
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web search NEUTRAL — Donlon has been studying mergers in the Milky Way for several years and has published other work on the matter.One says that a progenitor dwarf galaxy named Gaia Sausage/Enceladus (GSE) collided with …
https://www.sciencealert.com/the-milky-way-may-have-collided…
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web search NEUTRAL — The collision is thought to have resulted in a large number of stars with unusual orbits. Previously, scientists dated it at between eight and 11 billion years ago in a collision called the Gaia-Sausa…
https://penntoday.upenn.edu/news/researchers-upend-theory-ab…
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“this timing coincides with a sharp increase in the formation of star clusters in the Milky Way.”
CORROBORATED
Web search results link the GSE merger to impacts on star formation and the addition of globular clusters to the Milky Way.
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web search NEUTRAL — The Gaia Sausage or Gaia Enceladus is the remains of a dwarf galaxy that merged with the Milky Way about 8–11 billion years ago. At least eight globular clusters were added to the Milky Way along with…
https://en.wikipedia.org/wiki/Gaia_Sausage
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web search NEUTRAL — The Gaia-Sausage-Enceladus (GSE) merger denotes a major accretion event in the evolutionary history of the Milky Way, during which a progenitor galaxy with mass comparable to the present-day Large Mag…
https://www.emergentmind.com/topics/gaia-sausage-enceladus-g…
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web search NEUTRAL — Stars that formed after the Milky Way collided with a galaxy called Gaia-Sausage-Enceladus contain less metal than those that predate the merger.“For the first time, [we] identify a [merger-induced] d…
https://physics.aps.org/articles/v16/161
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“Matthew D A Orkney et al, Build-up and survival of the disc: from numerical models of galaxy formation to the Milky Way, Monthly Notices of the Royal Astronomical Society (2026). DOI: 10.1093/mnras/staf2154”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results to verify the specific paper title, author list, or DOI provided in the claim.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.