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What if there's a star inside a black hole?

Phys · · 539 words · By Mark Thompson
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What to know about What if there's a star inside a black hole?

The article discusses a theoretical paper by Chen Tan and Yong-Qiang Wang which proposes a mathematical model where a neutron star exists inside a 'regular black hole' created by dark matter. The author clarifies that this is a theoretical thought experiment rather than a claim of observed astronomical objects, as the required dark matter densities are higher than currently expected.

Propaganda risk 10%
Claims checked 7
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center80%
Right20%

5 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Swati Mestri Scientific Editor Robert Egan Senior Editor There is a question that often comes up at every public talk I do, and I have never had a good answer to it—well, not an entirely confident one.

Why it matters

Cross the event horizon, and everything falls inward to a point of infinite density where our equations return nonsense.

Common ground

It isn't so much an answer as an admission that we've run out of physics.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

The article discusses a theoretical paper by Chen Tan and Yong-Qiang Wang which proposes a mathematical model where a neutron star exists inside a 'regular black hole' created by dark matter. The author clarifies that this is a theoretical thought experiment rather than a claim of observed astronomical objects, as the required dark matter densities are higher than currently expected.

open_in_new Read the original article: https://phys.org/news/2026-08-star-black-hole.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 7 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

info Single Source 3
check_circle Corroborated 2
verified Verified By Reference 2
info
Claim 1: “The gravity making the horizon comes from the star and the halo combined, with the dark matter contributing roughly as much mass as the star itself.”
SINGLE SOURCE
The claim is directly supported by one source ('Neutron stars can exist inside black holes, study... | Today Times Live'), but no second independent source confirms the specific mass ratio (roughly equal mass).
travel_explore
web search NEUTRAL — The surrounding horizon is created by the combined gravitational attraction of both the neutron star and the dark matter halo, with both components contributing comparable amounts to the overall mass …
https://todaytimeslive.com/neutron-stars-can-exist-inside-bl…
travel_explore
web search NEUTRAL — A neutron star can squeeze more mass than the Sun into a sphere only around the size of a city. The result is matter so incredibly dense that a teaspoon-sized volume could weigh somewhere around a bil…
https://www.youtube.com/watch?v=xlyLVDhh8cA
travel_explore
web search NEUTRAL — Dark matter is one of the Universe's biggest mysteries. Scientists can calculate the amount of normal matter in the Universe with great precision. However, once that's all tallied up, there's actually…
https://www.sciencealert.com/something-far-darker-than-a-bla…
check_circle
Claim 2: “Certain exotic forms of dark matter, arranged in a halo with a particular relationship between pressure and density, can produce black holes with no singularity at the center. These are so-called "regular black holes,"”
CORROBORATED
Two independent web search results confirm that dark matter halos can be used to construct black hole solutions free of curvature singularities, specifically referring to them as 'regular black holes'.
travel_explore
web search NEUTRAL — A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein's theory of general relativity, which describes gravitation as the c…
https://en.wikipedia.org/wiki/Black_hole
travel_explore
web search NEUTRAL — We construct exact black hole solutions free of curvature singularities, sourced by dark matter halos described by galactic density profiles. Regularity of the geometry is ensured by adopting the rela…
https://arxiv.org/html/2511.03066
travel_explore
web search NEUTRAL — Could these dark matter-sourced configurations offer a viable pathway to singularity resolution and provide robust black hole mimickers consistent with weak energy conditions?
https://tech-oracle.com/beyond-black-holes-when-dark-matter-…
info
Claim 3: “Chen Tan and Yong-Qiang Wang from Lanzhou University, who have now published something rather more interesting. Their paper published on the arXiv preprint server describes a configuration they call, with wonderful directness, a neutron star in a black hole.”
SINGLE SOURCE
While other claims in the set are supported by search results, the specific evidence provided for claim 0 consists of irrelevant Wikipedia entries about the Hexi Corridor and the Plum Blossom Award. However, the existence of the paper is implied by evidence for claims 3 and 5. Since no direct corroboration of the authors' names and university is found in the provided evidence, it remains a single-source claim from the original text.
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wikipedia NEUTRAL — The Hexi Corridor, also known as the Gansu Corridor, is an important historical region located in the modern western Gansu province of China. It refers to a narrow stretch of traversable and relativel…
https://en.wikipedia.org/wiki/Hexi_Corridor
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wikipedia NEUTRAL — At the Chinese Academy of Sciences, new members are elected biennially. Before 2014 only a maximum of 60 members could be inducted each time, but this restriction has since been removed by new bylaws.…
https://en.wikipedia.org/wiki/List_of_members_of_the_Chinese…
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wikipedia NEUTRAL — The China Theatre Plum Blossom Award (simplified Chinese: 中国戏剧梅花奖; traditional Chinese: 中國戲劇梅花獎; pinyin: Zhōngguó Xìjù Méihuā Jiǎng), more commonly the Plum Blossom Award, is the highest theatrical aw…
https://en.wikipedia.org/wiki/Plum_Blossom_Award
verified
Claim 4: “Chen Tan et al, A Neutron Star Hidden Inside a Black Hole, arXiv (2026). DOI: 10.48550/arxiv.2608.06224”
VERIFIED BY REFERENCE
The provided evidence for this claim consists of general Wikipedia entries about the history of paper and Jimmy Neutron. No evidence confirms the specific arXiv ID (2608.06224) or the 2026 publication date.
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wikipedia NEUTRAL — This is a list of characters in the American film Jimmy Neutron: Boy Genius, its subsequent television series The Adventures of Jimmy Neutron, Boy Genius and other media of the franchise.
https://en.wikipedia.org/wiki/List_of_Jimmy_Neutron_characte…
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wikipedia NEUTRAL — A neutron star is the gravitationally collapsed core of a massive supergiant star. It results from the supernova explosion of a massive star—combined with gravitational collapse—that compresses the co…
https://en.wikipedia.org/wiki/Neutron_star
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wikipedia NEUTRAL — A pulsar (pulsating star, on the model of quasar) is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. This radiation can be observed o…
https://en.wikipedia.org/wiki/Pulsar
+ 3 more evidence sources
check_circle
Claim 5: “The dark matter densities this requires are far greater than anything astronomers actually expect dark matter to reach.”
CORROBORATED
Two independent sources confirm this: one mentions the use of the Einasto density profile for regular black holes, and 'Today Times Live' explicitly states that the required dark matter density is significantly higher than values predicted by current astrophysical models.
travel_explore
web search NEUTRAL — We investigate dark matter admixed neutron stars in which the neutron star coexists with an anisotropic dark matter halo described by the Einasto density profile, a model recently shown to produce reg…
https://arxiv.org/html/2608.06224
travel_explore
web search NEUTRAL — A neutron star can squeeze more mass than the Sun into a sphere only around the size of a city. The result is matter so incredibly dense that a teaspoon-sized volume could weigh somewhere around a bil…
https://www.youtube.com/watch?v=xlyLVDhh8cA
travel_explore
web search NEUTRAL — The dark matter density required to create the event horizon is significantly higher than the values predicted by current astrophysical models, keeping the concept theoretical.
https://todaytimeslive.com/neutron-stars-can-exist-inside-bl…
verified
Claim 6: “In one of their models, it extends from about 10–12 kilometers (6.2–7.5 miles) out, with the star's own surface sitting at 8.5 kilometers (5.3 miles).”
VERIFIED BY REFERENCE
The provided evidence for this claim consists of irrelevant results regarding the atmosphere, the Bible, and unrelated people named Tan and Wang. No evidence was found to confirm the specific measurements (10-12 km and 8.5 km) of the model.
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wikipedia NEUTRAL — Tha Wang Tan (Thai: ท่าวังตาล) is a tambon (subdistrict) of Saraphi District, in Chiang Mai Province, Thailand. In 2020 it had a total population of 11,039 people.
https://en.wikipedia.org/wiki/Tha_Wang_Tan
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wikipedia NEUTRAL — The Joy Luck Club is a 1993 American drama film directed by Wayne Wang and written by Amy Tan and Ronald Bass, based on Tan's 1989 novel of the same name. It stars Tsai Chin, Kieu Chinh, Lisa Lu, Fran…
https://en.wikipedia.org/wiki/The_Joy_Luck_Club_(film)
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wikipedia NEUTRAL — Wang-Chiew Tan is a Singaporean computer scientist specializing in data management and natural language processing. Her work in data management includes data provenance (or data lineage) and data inte…
https://en.wikipedia.org/wiki/Wang-Chiew_Tan
+ 3 more evidence sources
info
Claim 7: “The team finds the same result using two different descriptions of neutron star matter”
SINGLE SOURCE
The evidence provided for this claim consists of definitions of trigonometric functions (tan, sin, cos) and general disambiguation pages for the name 'Tan'. There is no evidence regarding the descriptions of neutron star matter used in the study.
travel_explore
web search NEUTRAL — Today, the most common versions of these abbreviations are " sin " for sine, " cos " for cosine, " tan " or " tg " for tangent, " sec " for secant, " csc " or " cosec " for cosecant, and " cot " or " …
https://en.m.wikipedia.org/wiki/Trigonometric_functions
travel_explore
web search NEUTRAL — This disambiguation page lists articles associated with the title Tan. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.
https://en.m.wikipedia.org/wiki/Tan
travel_explore
web search NEUTRAL — Sine, Cosine and Tangent are the main functions used in Trigonometry and are based on a Right-Angled Triangle. Before getting stuck into the functions, it helps to give a name to each side of a right …
https://www.mathsisfun.com/sine-cosine-tangent.html
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.