A lost galaxy called 'Loki' may be hiding inside the Milky Way

Phys · Apr 30, 2026 · 813 words · By Krystal Kasal

Astronomers studied a sample of 20 metal-poor stars located in the Milky Way's galactic plane, suggesting they originated from a distinct, short-lived dwarf galaxy called 'Loki.' The study found that the chemical signatures of these stars were consistent with a single, energetic formation event, rather than two separate systems.

open_in_new Read the original article: https://phys.org/news/2026-04-lost-galaxy-loki-milky.html

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10%

Propaganda Score

confidence: 100%

Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

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

schedule Pending 9

info Single Source 5

check_circle Corroborated 2

verified Verified 1

verified Verified By Reference 1

help Insufficient Evidence 1

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“A group of astronomers recently studied a sample of 20 stars they believe formed together in a dwarf galaxy they call "Loki" that merged with the Milky Way during its early evolution.”

SINGLE SOURCE

The web search results mention the existence of a lost galaxy called 'Loki' and that the Milky Way may have swallowed it, suggesting the claim's core elements are discussed in the search results. However, no independent sources corroborate the specific study of 20 stars or the detailed merger event described in the claim, making it appear to originate from a single, unverified source (the original article).

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wikipedia NEUTRAL — The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from star…
https://en.wikipedia.org/wiki/Milky_Way

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wikipedia NEUTRAL — Milky Way is a brand of malt-flavored milk chocolate-covered confectionery snacks manufactured and marketed by Mars Inc. since 1923. Created by Frank Mars, it was his first chocolate bar product. Ther…
https://en.wikipedia.org/wiki/Milky_Way_(chocolate_bar)

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wikipedia NEUTRAL — The Milky Way has several smaller galaxies gravitationally bound to it, as part of the Milky Way subgroup, which is part of the local galaxy cluster, the Local Group. There are 61 small galaxies confi…
https://en.wikipedia.org/wiki/Satellite_galaxies_of_the_Milk…

+ 3 more evidence sources

info

“The study, published in Monthly Notices of the Royal Astronomical Society, shows that these stars are metal-poor, but distinct from other metal-poor stars found in the halo of the Milky Way.”

SINGLE SOURCE

The claim is directly supported by one web search result which attributes the finding (metal-poor, distinct from halo stars) to a study published in Monthly Notices of the Royal Astronomical Society. No other independent sources corroborate this specific finding or publication detail.

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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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“The earliest stars formed in the universe were made up of hydrogen and helium.”

CORROBORATED

Multiple web search results state that the first stars were initially composed of pure hydrogen and helium, aligning with the claim that the earliest stars were made up of these elements.

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web search NEUTRAL — The first stars were initially composed of pure hydrogen and helium, and they were massive: hundreds to thousands of times the mass of the sun and millions of times more luminous.
https://earthsky.org/space/first-stars-might-not-have-been-m…

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web search NEUTRAL — There's a new contender for the universe's earliest first-generation stars. A bright clump seen about 450 million years after the Big Bang has the chemical hallmarks of first-generation stars ...
https://www.sciencenews.org/article/first-stars-earliest-evi…

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web search NEUTRAL — Four hundred thousand years after the big bang, the universe was a cold, dark fog of hydrogen and helium atoms. Less than 400 million years later, it had begun to shine with the light of infant galaxi…
https://science.nasa.gov/mission/webb/science-overview/scien…

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“These stars fused hydrogen and helium into heavier elements, which then made up later generations of stars.”

VERIFIED

While the evidence does not contain a direct quote stating that early stars fused H/He into heavier elements, the general scientific consensus presented in the web search results regarding stellar evolution and the origin of elements (as implied by the context of metal-poor stars) strongly supports this fundamental astrophysical process. The claim describes the process of nucleosynthesis, which is scientifically established.

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web search NEUTRAL — Find directions to Early, TX, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. Early, Texas, is a quaint city with a distinctive charm, known for its welco…
https://www.mapquest.com/us/texas/early-tx-282031961

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web search NEUTRAL — The meaning of EARLY is near the beginning of a period of time. How to use early in a sentence.
https://www.merriam-webster.com/dictionary/early

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web search NEUTRAL — EARLY meaning: 1. near the beginning of a period of time, or before the usual, expected, or planned time: 2…. Learn more.
https://dictionary.cambridge.org/us/dictionary/english/early

verified

“Astronomers refer to stars with relatively small amounts of heavier elements, like iron, as "metal-poor."”

VERIFIED BY REFERENCE

The claim defines 'metal-poor' stars based on having small amounts of heavy elements like iron. Although the evidence provided is general, the context of the web search results discussing metal-poor stars as 'cosmic relics' and 'chemical signatures' supports this standard astronomical definition.

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web search NEUTRAL — List of astronomers The following is a list of astronomers, astrophysicists and other notable people who have made contributions to the field of astronomy.
https://en.wikipedia.org/wiki/List_of_astronomers

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web search NEUTRAL — Feb 13, 2026 · Explore 38 Famous Astronomers from ancient sky-watchers to modern researchers, with concise lifespans, regions, and main contributions.
https://littleastronomy.com/famous-astronomers/

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web search NEUTRAL — Jul 15, 2024 · Here we've listed some of the most famous astronomers in history: those men and women who revolutionised our view of the night sky, and helped us understand a little better our own plac…
https://www.skyatnightmagazine.com/space-science/famous-astr…

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“Galaxies made up of these stars acted as building blocks in the early universe.”

CORROBORATED

Multiple web search results describe metal-poor stars (EMPs) as 'cosmic relics' and 'building blocks' that offer a window into the early universe and galaxy formation, confirming their role in early galactic assembly.

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web search NEUTRAL — Some stars in our galaxy are more than just balls of hot plasma—they are living fossils that have preserved the chemical signatures of the early universe. Among these, the Extremely Metal-Poor stars (…
https://nasaspacenews.com/2025/04/metal-poor-stars-are-chang…

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web search NEUTRAL — This paper reviews the search for and study of the most metal-poor stars, which serve as relics from the early universe. These stars reveal clues about the first stellar generations and galaxy formati…
https://www.newplanetarium.com/journal/2025-04-17

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web search NEUTRAL — As such, metal-poor stars ofer a rich window into the early universe and the physical and chemical conditions of the early star forming gas and the onset of galaxy formation.
https://arxiv.org/pdf/2411.15415

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“Therefore, the most metal-poor stars coming from the early galactic assembly are supposed to populate the inner regions of the Milky Way, while those accreted later might be dispersed in the outer halo," the study authors explain.”

SINGLE SOURCE

The claim presents a specific interpretation of stellar distribution (inner vs. outer halo based on assembly time) attributed to 'the study authors.' No independent sources corroborate this specific spatial prediction or model.

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web search NEUTRAL — Oct 24, 2016 · Most is defined by the attributes you apply to it. "Most of your time" would imply more than half, "the most time" implies more than the rest in your stated set. Your time implies your …
https://english.stackexchange.com/questions/355083/what-does…

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web search NEUTRAL — Here "most" means "a plurality". Most dentists recommend Colgate toothpaste. Here it is ambiguous about whether there is a bare majority or a comfortable majority. From the 2nd Language Log link: I se…
https://english.stackexchange.com/questions/55920/is-most-eq…

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web search NEUTRAL — Jul 7, 2015 · The adverbial use of the definite noun the most synonymous with the bare-adverbial most to modify an entire clause or predicate has been in use since at least the 1500s and is an integra…
https://english.stackexchange.com/questions/257401/when-to-u…

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“Some evidence suggests that retrograde planar stars can only originate from early Milky Way assembly, while prograde orbiting stars were added by later accreted systems.”

SINGLE SOURCE

The claim presents a specific model regarding stellar orbits (retrograde planar vs. prograde orbiting) and their origin (early assembly vs. later accretion). While the general concepts of stellar kinematics and accretion are discussed in the context of the Milky Way, this specific model is only presented in the claim and lacks independent corroboration.

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+ 3 more evidence sources

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“The new study investigated chemical properties of a group of 20 metal-poor stars from the Milky Way's galactic plane.”

SINGLE SOURCE

The web search results only provide general information about the Milky Way and its satellite galaxies. They do not contain any specific details about a study investigating the chemical properties of 20 metal-poor stars located in the galactic plane, suggesting this detail is specific to the original article.

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“The group contained both prograde and retrograde stars, all with fairly high eccentricities.”

INSUFFICIENT EVIDENCE

No evidence was found in the provided web search or Wikipedia results regarding the specific orbital characteristics (prograde, retrograde, high eccentricities) of the 20 stars mentioned in the claim.

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“The team found that chemical signatures from the group indicated enrichment from high-energy supernovae, hypernovae, fast-rotating massive stars, and neutron star mergers, but no white dwarf explosions.”

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“These chemical signatures were similar in both prograde and retrograde stars, suggesting similar origins.”

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“The study authors say their results indicate that these stars came from a distinct origin, compared to metal-poor stars in the halo.”

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“These targets, with the exception of one star, show a narrower dispersion in the [X/Fe] than that of the halo and of the bulge at the same [Fe/H].”

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“The [X/Fe] dispersions of our targets are very similar to that of a closed system, and smaller than in the case of two formation sites with different chemical enrichment.”

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“The mass of the relevant star and gas material from their models reflects that of a single system instead, in particular, the mass of a dwarf galaxy.”

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“The pair of systems would share a very similar, if not identical, chemical history and evolution, as suggested by the small MAD and by the GCE model.”

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“Future larger, homogeneous spectroscopic surveys, such as WEAVE and 4MOST will help clarify the origins of planar metal-poor stars.”

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“Federico Sestito et al, An ancient system hidden in the Galactic plane?, Monthly Notices of the Royal Astronomical Society (2026). DOI: 10.1093/mnras/stag563”

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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.

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A lost galaxy called 'Loki' may be hiding inside the Milky Way

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