Astronomers de-fog exoplanet atmospheres with new cloud-detecting method

Phys · May 21, 2026 · 854 words · By Johns Hopkins University

Astronomers using the James Webb Space Telescope have identified cloud cycles on the exoplanet WASP-94A b, observing clouds in the mornings and clear skies in the evenings. This method allows researchers to more accurately determine the planet's atmospheric composition, finding it is more similar to Jupiter than previously thought.

open_in_new Read the original article: https://phys.org/news/2026-05-astronomers-de-fog-exoplanet-atmospheres.html

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Propaganda Score

confidence: 100%

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

fact_checkFact-Check Results

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

info Single Source 5

verified Verified By Reference 2

help Insufficient Evidence 2

check_circle Corroborated 1

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“Sand clouds form every morning but clear up by nightfall on WASP-94A b”

CORROBORATED

Multiple sources, including Scientific American and an Astrobiology publication, describe the cycle of clouds building by daybreak and dissipating on the dayside/evening.

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wikipedia NEUTRAL — Obligate mutualism is a special case of mutualism where an ecological interaction between species mutually benefits each other, and one or all species are unable to survive without the other. In some …
https://en.wikipedia.org/wiki/Obligate_mutualism

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wikipedia NEUTRAL — WASP-94 is a binary star system located about 690 light-years (210 parsecs) away in the constellation Microscopium. It consists of two F-type stars separated by 15″, corresponding to a projected separ…
https://en.wikipedia.org/wiki/WASP-94

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wikipedia NEUTRAL — WASP or Wide Angle Search for Planets is an international consortium of several academic organisations performing an ultra-wide angle search for exoplanets using transit photometry. The array of robot…
https://en.wikipedia.org/wiki/Wide_Angle_Search_for_Planets

+ 3 more evidence sources

verified

“WASP-94A b [is] a well-studied gas giant in a constellation located nearly 700 light years away from Earth”

VERIFIED BY REFERENCE

Wikipedia and NASA Exoplanet Archive confirm WASP-94 is a binary system approximately 690 light-years away and that WASP-94 A b is a confirmed planet (gas giant).

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web search NEUTRAL — WASP-94 is a binary star system located about 690 light-years away in the constellation Microscopium. It consists of two F-type stars separated by 15″, corresponding to a projected separation of 2700 …
https://en.wikipedia.org/wiki/WASP-94

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web search NEUTRAL — An artistic representation of WASP94-A b, a gas giant exoplanet nearly 700 light-years from Earth. Clouds build as air flows over the dark side of the planet, reaching a large swell by daybreak.
https://www.scientificamerican.com/article/jwst-sees-partly-…

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web search NEUTRAL — CoRoT Exoplanet. SuperWASP Light Curves.WASP-94 A b Planetary Parameters (6 Solutions). + − Status. Confirmed Planet.
https://exoplanetarchive.ipac.caltech.edu/overview/WASP-94+A…

info

“Using data from the James Webb Space Telescope (JWST), research published in the journal Science is among the first to detect cloud cycles on a Hot Jupiter exoplanet”

SINGLE SOURCE

While JWST data is mentioned in several sources for exoplanet research, the specific claim about a paper in 'Science' being among the first to detect cloud cycles on a Hot Jupiter is not explicitly corroborated by the provided evidence snippets, though the general context of JWST's role is supported.

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wikipedia NEUTRAL — Europa ( ) is the smallest and least massive of Jupiter's four Galilean moons. It is observable from Earth with common binoculars and is a planetary-mass moon, slightly smaller and less massive than E…
https://en.wikipedia.org/wiki/Europa_(moon)

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wikipedia NEUTRAL — The James Webb Space Telescope (JWST) is a space telescope designed to conduct infrared astronomy. It is the largest telescope in space, and is equipped with high-resolution and high-sensitivity instr…
https://en.wikipedia.org/wiki/James_Webb_Space_Telescope

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wikipedia NEUTRAL — K2-18b, also known as EPIC 201912552 b, is an exoplanet orbiting the red dwarf K2-18, located 124 light-years (38 pc) away from Earth. The planet is a sub-Neptune about 2.6 times the radius of Earth, …
https://en.wikipedia.org/wiki/K2-18b

+ 3 more evidence sources

verified

“To study WASP-94A b in the Microscopium constellation, Sing and his team of researchers gathered data as the planet passed directly in front of its star”

VERIFIED BY REFERENCE

Wikipedia and EurekAlert! explicitly state that WASP-94 is located in the constellation Microscopium.

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wikipedia NEUTRAL — Eta Microscopii, Latinised as η Microscopii, is a solitary star in the constellation Microscopium. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.53. …
https://en.wikipedia.org/wiki/Eta_Microscopii

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+ 3 more evidence sources

info

“mornings are riddled with clouds made of magnesium silicate, a common mineral found in rocks, while the evening has clear skies”

SINGLE SOURCE

Scientific American confirms the cycle of clouds at daybreak and clear skies in the evening, but the specific chemical composition (magnesium silicate) is not explicitly detailed in the provided evidence snippets.

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+ 3 more evidence sources

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“As they drift into the scorching heat of over 1,000 degrees on the dayside, the chemicals that make up the clouds boil away”

SINGLE SOURCE

The evidence provided discusses temperatures for other planets (like WASP-76b) or general 'ultra-hot Jupiters', but does not provide the specific temperature for WASP-94A b.

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web search NEUTRAL — WASP-76b is one of the most extreme with a dayside temperature of over 2,000 degrees. A team of researchers has found that it’s even more bizarre than first thought! It’s tidally locked to its host st…
https://scitechdaily.com/iron-winds-and-fiery-skies-the-biza…

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web search NEUTRAL — With day-side temperatures elevated enough for all atmospheric constituents to be present in gas form, ultra-hot Jupiters offer a unique opportunity to probe the composition of giant planets.
https://www.researchgate.net/figure/Dayside-and-nightside-ef…

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web search NEUTRAL — The intense stellar irradiation of ultra-hot Jupiters results in some of the most extreme atmospheric environments in the planetary regime. On their daysides, temperatures can be sufficiently high for…
https://astrobiology.com/2025/08/quantifying-thermal-water-d…

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“Previously, when the clouds were averaged in, the data suggested the planet was made of hundreds of times more oxygen and carbon than Jupiter”

SINGLE SOURCE

No evidence in the provided search results mentions previous data regarding oxygen and carbon levels relative to Jupiter for WASP-94A b.

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web search NEUTRAL — WASP-94Bb is a non-transiting planet that has been detected only by radial velocity, so it has no measured radius and true mass. Its minimum mass is 62% the mass of Jupiter.[3]. The WASP-94 A planetar…
https://en.wikipedia.org/wiki/WASP-94

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web search NEUTRAL — Most interestingly, WASP-94A b is in a retrograde, misaligned orbit around its host star, tightly constrained with recent HARPS mea-surements of its projected obliquity 𝜆 = −123.0 ± 3.0 (Ahrer et al. …
https://arxiv.org/pdf/2505.11224

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web search NEUTRAL — WASP-94 A Nearby Data (within 30 arcseconds). + − Known Objects. 2 Confirmed Planets. 4 2MASS Point Source Catalog. Data Files. 1 SuperWASP Time Series.
https://exoplanetarchive.ipac.caltech.edu/overview/WASP-94

info

“The new data, however, shows WASP-94A b has only five times the amount of oxygen and carbon [than Jupiter]”

SINGLE SOURCE

While sources mention JWST's ability to determine oxygen and carbon, the specific figure of 'five times the amount' is not present in the evidence.

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web search NEUTRAL — But researchers realized WASP-94A b offered a potential work-around. The planet is held so close by its star that it has become tidally locked, much like the moon around Earth: the exoplanet’s spin an…
https://www.scientificamerican.com/article/jwst-sees-partly-…

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web search NEUTRAL — atmosphere of misaligned hot Jupiter WASP-94Ab using JWST.With JWST we can characterise the atmospheres of these types of planets more precisely than previously possible, primarily because it allows u…
https://arxiv.org/pdf/2505.11224

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web search NEUTRAL — We have entered a new era of detailed exoplanet and brown dwarf atmospheric characterization with the James Webb Space Telescope (JWST), enabling very high signal-to-noise spectroscopic observations.
https://escholarship.org/uc/item/6zz940mk

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“Using WASP-94 Ab as a benchmark, the team looked at eight other hot gas giants and discovered the same distinctive cloud cycle on two other worlds: WASP-39 b and WASP-17 b”

INSUFFICIENT EVIDENCE

No evidence was found in the search results regarding a benchmark study of eight other gas giants or the specific cloud cycles of WASP-39 b and WASP-17 b in this context.

help

“Sagnick Mukherjee et al, Cloudy mornings and clear evenings on a gas giant exoplanet, Science (2026). DOI: 10.1126/science.adx5903”

INSUFFICIENT EVIDENCE

No evidence was found to confirm the existence of a 2026 paper by Sagnick Mukherjee with the specified DOI.

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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Astronomers de-fog exoplanet atmospheres with new cloud-detecting method

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