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Planet 9 volunteers double known population of brown dwarfs

Phys · · 386 words · By NASA
Astronomy NASA Research Citizen Science

NASA's Backyard Worlds: Planet 9 project has identified over 3,000 new brown dwarfs using data from the WISE and NEOWISE-R missions. The discoveries were made possible through the efforts of approximately 200,000 citizen science volunteers, many of whom are credited as co-authors on the resulting research paper.

open_in_new Read the original article: https://phys.org/news/2026-05-planet-volunteers-population-brown-dwarfs.html

analyticsAnalysis

10%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

psychologyDetected Techniques

warning
Loaded Language 70% confidence
Using words with strong emotional connotations to influence an audience.

fact_checkFact-Check Results

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

check_circle Corroborated 3
info Single Source 3
verified Verified By Reference 2
help Insufficient Evidence 2
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“volunteers have essentially doubled the number of known brown dwarfs, with over 3,000 new discoveries made over the past 10 years since the project began”
CORROBORATED
Multiple independent web sources confirm that the Backyard Worlds: Planet 9 project volunteers discovered over 3,000 new brown dwarfs over 10 years, essentially doubling the known population.
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wikipedia NEUTRAL — Backyard Worlds: Planet 9 is a NASA-funded citizen science project which is part of the Zooniverse web portal. It aims to discover new brown dwarfs, faint objects that are less massive than stars, som…
https://en.wikipedia.org/wiki/Backyard_Worlds
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wikipedia NEUTRAL — Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian obj…
https://en.wikipedia.org/wiki/Planet_Nine
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wikipedia NEUTRAL — Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and continued at th…
https://en.wikipedia.org/wiki/Planets_beyond_Neptune
+ 3 more evidence sources
verified
“Brown dwarfs are balls of gas the size of Jupiter, less massive than stars.”
VERIFIED BY REFERENCE
Wikipedia and Britannica confirm brown dwarfs are substellar objects (less massive than stars) and are compared to gas giants like Jupiter in size/composition, though they are significantly more massive than Jupiter itself (13-80x).
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web search NEUTRAL — Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars. Their mass is approximately 13 to 80 times that of Jupi…
https://en.wikipedia.org/wiki/Brown_dwarf
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web search NEUTRAL — Brown dwarf, astronomical object that is intermediate between a planet and a star. Brown dwarfs usually have a mass less than 0.075 that of the Sun, or roughly 75 times that of Jupiter. (This maximum …
https://www.britannica.com/science/brown-dwarf
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web search NEUTRAL — Despite their name, brown dwarfs can be up to 70 times more massive than gas giants like Jupiter. Brown dwarfs form like stars do, by the contraction of gas that collapses into a dense core under the …
https://science.nasa.gov/mission/webb/science-overview/scien…
info
“There's one [brown dwarf] for every three or four stars near the sun.”
SINGLE SOURCE
The provided evidence for this claim consists of general definitions of 'ratios' and 'ratio calculators' rather than astronomical data regarding the frequency of brown dwarfs relative to stars.
travel_explore
web search NEUTRAL — In mathematics, a ratio (/ ˈreɪ.ʃ (i.) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to l…
https://en.wikipedia.org/wiki/Ratio
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web search NEUTRAL — Aug 1, 2025 · Compare ratios and evaluate as true or false to answer whether ratios or fractions are equivalent. This ratio calculator will accept integers, decimals and scientific e notation with a l…
https://www.calculatorsoup.com/calculators/math/ratios.php
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web search NEUTRAL — A ratio tells us how much of one thing we have compared to another. There are 3 blue squares to 1 yellow square.
https://www.mathsisfun.com/numbers/ratio.html
info
“this vital new list of brown dwarfs has revealed a new variety of objects—the extreme T subdwarfs and many other rarities, such as ultra-cool objects and a brown dwarf that appears to have aurorae.”
SINGLE SOURCE
While the general project (Backyard Worlds) is corroborated, the specific details about 'extreme T subdwarfs' and 'aurorae' are not explicitly detailed in the provided evidence snippets, though the project's goal to find brown dwarfs is confirmed.
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wikipedia NEUTRAL — Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian obj…
https://en.wikipedia.org/wiki/Planet_Nine
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wikipedia NEUTRAL — Wolf 1130 is a nearby pre-cataclysmic triple star system consisting of a cold subdwarf of spectral type sdM3 (A), an ultramassive white dwarf (B) and a cold brown dwarf of spectral type sdT8 (C). Wolf…
https://en.wikipedia.org/wiki/Wolf_1130
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wikipedia NEUTRAL — Backyard Worlds: Planet 9 is a NASA-funded citizen science project which is part of the Zooniverse web portal. It aims to discover new brown dwarfs, faint objects that are less massive than stars, som…
https://en.wikipedia.org/wiki/Backyard_Worlds
+ 3 more evidence sources
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“The discoveries are published in a paper on the arXiv preprint server, led by astronomer Adam Schneider from the U.S. Naval Observatory.”
CORROBORATED
Multiple sources confirm the discoveries were led by astronomer Adam Schneider from the U.S. Naval Observatory and published on the arXiv preprint server.
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wikipedia NEUTRAL — This is a list of notable present and former faculty, staff, and students of San Diego State University (SDSU).
https://en.wikipedia.org/wiki/List_of_San_Diego_State_Univer…
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wikipedia NEUTRAL — This is a list of women said to have given birth to 20 or more children and men said to have fathered more than 25 children.
https://en.wikipedia.org/wiki/List_of_people_with_the_most_c…
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web search NEUTRAL — The discoveries were announced in a new paper led by astronomer Adam Schneider from the U.S. Naval Observatory. The study was published on the arXiv preprint server and includes contributions from abo…
https://knowridge.com/2026/05/volunteers-help-discover-thous…
+ 2 more evidence sources
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“They represent work done over the course of ten years aided by a team of roughly 200,000 volunteers.”
CORROBORATED
Web search results explicitly state the study included contributions from about 200,000 volunteers over the past decade.
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wikipedia NEUTRAL — The president of the United States is the head of state and head of government of the United States, indirectly elected to a four-year term via the Electoral College. Under the U.S. Constitution, the …
https://en.wikipedia.org/wiki/List_of_presidents_of_the_Unit…
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wikipedia NEUTRAL — The is a grammatical article in English, denoting nouns that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is th…
https://en.wikipedia.org/wiki/The
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wikipedia NEUTRAL — The is the definite article in English. The, or THE, may also refer to:
https://en.wikipedia.org/wiki/The_(disambiguation)
+ 3 more evidence sources
info
“Of the paper's 75 authors, 61 are volunteers.”
SINGLE SOURCE
The provided evidence for this claim contains irrelevant information about a movie called '61' and internet memes, not the authorship of the scientific paper.
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web search NEUTRAL — It stars Barry Pepper as Roger Maris and Thomas Jane as Mickey Mantle on their quest to break Babe Ruth 's 1927 single-season home run record of 60 during the 1961 season of the New York Yankees. The …
https://en.wikipedia.org/wiki/61*
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web search NEUTRAL — Oct 24, 2025 · One guy, one stare, two cursed numbers... Check out our new MEME STORE: https://thememestore.com/...more. Audio tracks for some languages were automatically generated. Learn more. The 6…
https://www.youtube.com/watch?v=NnGWUdviums
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web search NEUTRAL — Oct 29, 2025 · What Is The 61 Meme? The 61 Meme (also called 61 New Meme or Six Swan) is a viral TikTok trend from October 2025 where users joke about the number "61" replacing the earlier 67 Meme.
https://knowyourmeme.com/videos/434399-61-meme
verified
“The volunteers discovered these brown dwarfs in images taken by NASA's retired Wide-field Infrared Survey Explorer (WISE) and Near-Earth-Object WISE Reactivation mission (NEOWISE-R).”
VERIFIED BY REFERENCE
Wikipedia confirms WISE is a NASA infrared telescope, and other sources link the Backyard Worlds project's discoveries to NASA's citizen science efforts using such data.
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web search NEUTRAL — Wide-field Infrared Survey Explorer was a NASA infrared astronomy space telescope in the Explorers Program launched in December 2009. WISE discovered thousands of minor planets and numerous star clust…
https://en.wikipedia.org/wiki/Wide-field_Infrared_Survey_Exp…
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web search NEUTRAL — Nasa's citizen science project has used 2,00,000 citizen scientists to discover over 3,000 new failed stars, doubling the known total in the universe.
https://www.indiatoday.in/science/story/nasa-citizen-scienti…
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web search NEUTRAL — A new paper from NASA's Backyard Worlds: Planet 9 project announces that volunteers have essentially doubled the number of known brown dwarfs, with over 3,000 new discoveries made over the past 10 yea…
https://phys.org/news/2026-05-planet-volunteers-population-b…
help
“They examined the data using the Zooniverse citizen science platform, searching for moving objects by blinking images taken over a 16-year time period.”
INSUFFICIENT EVIDENCE
No evidence was provided in the search results regarding the specific use of the Zooniverse 'blinking' method or the 16-year time period for this specific claim.
help
“Adam C. Schneider et al, Three Thousand Motion-Confirmed L and T Dwarf Candidates from the Backyard Worlds:~Planet 9 Citizen Science Project, arXiv (2026). DOI: 10.48550/arxiv.2604.01323”
INSUFFICIENT EVIDENCE
No evidence was found in the provided results to verify the specific paper title, the 2026 date, or the DOI provided.
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.