JWST hunts for an 'Earth-moon' twin in a habitable zone, but the star has other plans

Phys · Apr 27, 2026 · 704 words · By Andy Tomaswick

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What to know about Scientific Discovery/Exoplanets

Astronomers used the James Webb Space Telescope (JWST) to search for an exomoon orbiting the planets TOI-700 d and TOI-700 e. The search was complicated by a repeating noise pattern, known as 'red noise,' generated by stellar granulation, which obscured the faint signal expected from a moon. The research concluded that definitive evidence remains elusive, suggesting future algorithmic improvements may be necessary for a breakthrough.

Propaganda risk 10%

Claims checked 11

Techniques found 1

Topics 1

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Coverage gap: Low Left coverage

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Center100%

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

What happened

JWST hunts for an 'Earth-moon' twin in a habitable zone, but the star has other plans Lisa Lock scientific editor Andrew Zinin lead editor The moon has played a huge role in the development of Earth.

Why it matters

It stabilizes the planet, tempers dramatic climate swings, and possibly even provides the tidal heating that might have led to the first life forms.

Common ground

So it's natural we would want to find a similar Earth/Luna system somewhere else in the cosmos.

Perspective signals

The tension in the story is sharpened by Loaded Language: language that can make the dispute feel more urgent, personal, or adversarial than the underlying facts alone.

Follow-up questions

What new context would change how readers understand this Scientific Discovery/Exoplanets story?
What evidence would most clearly confirm or weaken the claim that The researchers also determined that, if someone was able to develop a noise-reducing algorithm that can remove the "red noise," and if there is actually a moon in the system, the dataset should show it?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://phys.org/news/2026-04-jwst-earth-moon-twin-habitable.html

analyticsAnalysis

10%

Propaganda Score

confidence: 95%

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

psychologyPropaganda Techniques Detected

eFinder identified 1 propaganda technique in this article. These signals explain how wording, emphasis, or missing context can shape a reader's interpretation.

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Loaded Language 60% confidence

Using words with strong emotional connotations to influence an audience.

Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.

Why it matters: Recognizing loaded language helps readers compare the article's framing with the underlying facts and with coverage from other sources.

fact_checkClaims Checked

eFinder analyzed this article and checked 11 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 5

info Single Source 3

help Insufficient Evidence 2

schedule Pending 1

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Claim 1: “The researchers also determined that, if someone was able to develop a noise-reducing algorithm that can remove the "red noise," and if there is actually a moon in the system, the dataset should show it.”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results or Wikipedia entries to confirm or deny the specific conclusion regarding the visibility of a moon's signal after noise reduction.

info

Claim 2: “The signal itself oscillated every 16 minutes and had an amplitude of around 46 ppm—essentially washing out any 20 ppm signal a moon might give off.”

SINGLE SOURCE

The specific details—oscillation every 16 minutes and amplitude of 46 ppm—are presented together in the context of the research findings, but this precise combination of numbers is not corroborated by other sources provided.

travel_explore

web search NEUTRAL — In science, Brownian noise, also known as Brown noise or red noise, is the type of signal noise produced by Brownian motion, hence its alternative name of random walk noise.
https://en.wikipedia.org/wiki/Brownian_noise

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web search NEUTRAL — Abstract In the past, the signal-to-noise of a chromatographic peak determined from a single measurement has served as a convenient figure of merit used to compare the performance of two different MS …
https://www.agilent.com/cs/library/technicaloverviews/public…

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web search NEUTRAL — A common way to statistically assess the significance of a broad spectral peak in signals and the synchronization between signals is to compare with simple noise processes. At present, wavelet analysi…
https://onlinelibrary.wiley.com/doi/10.1155/2021/5462965

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Claim 3: “That star is TOI-700. Located about 100 light years away from Earth, TOI-700 is a small M-dwarf star that has a wide variety of known exoplanets, including two Earth-sized ones in the "habitable" zone, known as TOI-700 d and TOI-700 e.”

CORROBORATED

Multiple web search results and Wikipedia entries confirm that TOI-700 is a small M-dwarf star located around 100 light-years away in the Dorado constellation, and that it hosts TOI-700 d and TOI-700 e, which are described as Earth-sized and within the habitable zone.

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wikipedia NEUTRAL — The list of exoplanets detected by the Transiting Exoplanet Survey Satellite (TESS) contains bodies with a wide variety of properties, with significant ranges in orbital distances, masses, radii, comp…
https://en.wikipedia.org/wiki/List_of_exoplanets_discovered_…

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wikipedia NEUTRAL — A super-Earth is a type of exoplanet with a mass higher than Earth's, but substantially below those of the Solar System's ice giants, Uranus and Neptune, which are 14.5 and 17.1 times Earth's mass res…
https://en.wikipedia.org/wiki/Super-Earth

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wikipedia NEUTRAL — TOI-1338 is a binary star system located in the constellation Pictor, about 1,320 light-years from Earth. It is orbited by two known circumbinary planets, TOI-1338 b, discovered by the Transiting Exop…
https://en.wikipedia.org/wiki/TOI-1338

+ 3 more evidence sources

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Claim 4: “According to the paper, these planets are the best candidates we have for holding onto a stable moon, due to their proximity and gravitational pull.”

CORROBORATED

Web search results explicitly state that TOI-700 d and TOI-700 e are considered the best candidates for holding onto a stable moon, referencing the findings from the paper.

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wikipedia NEUTRAL — TOI-700 is a red dwarf 101.4 light-years away from Earth located in the Dorado constellation that hosts TOI-700 d, the first Earth-sized exoplanet in the habitable zone discovered by the Transiting Ex…
https://en.wikipedia.org/wiki/TOI-700

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wikipedia NEUTRAL — TOI-700 d is a dense, rocky, near-Earth-sized exoplanet orbiting within the habitable zone of the red dwarf TOI-700. It is located roughly 101.4 light-years (31.1 pc) away from Earth in the constellat…
https://en.wikipedia.org/wiki/TOI-700_d

+ 3 more evidence sources

schedule

Claim 5: “Emily K. Pass et al, The JWST Search for Earth-Luna Analogs: Upper Limits on Exomoons and Refined Ephemerides for TOI 700 d and e, arXiv (2026). DOI: 10.48550/arxiv.2604.05235”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 6: “The best conclusion the researchers could draw with that level of certainty was that their observations were only sensitive to moons larger than Ganymede (the largest moon in our own solar system) on orbits longer than 2 days.”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results or Wikipedia entries to confirm or deny the specific conclusion regarding sensitivity limits (larger than Ganymede on orbits longer than 2 days).

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Claim 7: “When analyzing the data, the research team realized there was a repeating noise pattern known as "red noise." This signal is caused by stellar granulation—the boiling and bubbling that happens in the plasma on the surface of a star.”

CORROBORATED

Web search results confirm the existence and definition of 'red noise' and its association with stellar activity or noise patterns, though the specific mechanism of 'stellar granulation' is not explicitly linked across multiple sources.

travel_explore

web search NEUTRAL — The term "red noise" comes from the "white noise"/"white light" analogy; red noise is strong in longer wavelengths, similar to the red end of the visible spectrum. In acoustics, this translates to a s…
https://en.wikipedia.org/wiki/Brownian_noise

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web search NEUTRAL — In general, yield predictions assume uncorrelated noise (‘white noise’). In this paper, we show that the effect of red noise on the detection threshold and the expected yields cannot be neglected in t…
https://www.researchgate.net/publication/1789409_The_effect_…

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web search NEUTRAL — 'Red noise can trick us'. But, of course, pulsars also generate their own noise, which can muddy the signals. "Pulsars do have some intrinsic noise called 'red noise,'" Witt said.
https://phys.org/news/2023-06-narrows-elusive-pairs-monster-…

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Claim 8: “The moon has played a huge role in the development of Earth. It stabilizes the planet, tempers dramatic climate swings, and possibly even provides the tidal heating that might have led to the first life forms.”

CORROBORATED

Multiple web search results discuss the stabilizing role of the Moon on Earth's climate and planetary stability, citing concepts like tidal heating and atmospheric retention, which corroborates the claim's core points.

travel_explore

web search NEUTRAL — Three possible episodes of tidal heating of the Moon can be identified: the evection resonance, at approximately 8 Earth radii (RE) 27, 28, 29; the Laplace plane transition (LPT), at 16-22 RE ...
https://www.nature.com/articles/s41586-024-08231-0

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web search NEUTRAL — But a neighboring shield may have helped our planet retain its atmosphere and eventually go on to develop life and habitable conditions. That shield was the Moon, says a NASA-led study in the journal …
https://www.nasa.gov/solar-system/earth-and-moon-once-shared…

travel_explore

web search NEUTRAL — Discover how Earth without Moon would disrupt planetary stability, affecting rotation, tides, and climate—and why complex life couldn't survive these changes.
https://www.sciencetimes.com/articles/61278/20260208/earth-w…

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Claim 9: “Data described in the paper increased the accuracy of our orbital estimates of the planets by an order of magnitude, and improved our measure of their radius (1.145 times Earth for d and 0.919 times Earth for e) by a factor of 2 to 3.”

SINGLE SOURCE

The specific quantitative improvements (order of magnitude increase in orbital estimates, factor of 2 to 3 improvement in radius) are mentioned in the context of the paper's findings, but the provided evidence does not contain the original paper or independent confirmation of these precise numerical improvements.

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+ 3 more evidence sources

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Claim 10: “The researchers calculated that, in order to detect a Luna-analog, JWST would need to detect a 20 parts per million (ppm) dip in starlight.”

CORROBORATED

A web search result directly quotes the calculation that detecting a Luna-analog requires JWST to detect a 20 parts per million (ppm) dip in starlight.

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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 — MoM-z14 is the most distant known galaxy, with a redshift of z = 14.44. The galaxy was first imaged on 16 May 2025 by the NIRcam instrument aboard the James Webb Space Telescope (JWST). That image cap…
https://en.wikipedia.org/wiki/MoM-z14

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wikipedia NEUTRAL — The spacecraft bus is a carbon fibre box that houses systems of the telescope and so is the primary support element of the James Webb Space Telescope, launched on 25 December 2021. It hosts a multitud…
https://en.wikipedia.org/wiki/Spacecraft_bus_(James_Webb_Spa…

+ 3 more evidence sources

info

Claim 11: “A new paper, available on the arXiv preprint server, from Emily Pass and her colleagues at MIT, Harvard, and the University of Chicago describes using the James Webb Space Telescope to track some of the most promising exomoon candidates—only to be foiled by the star they were orbiting.”

SINGLE SOURCE

The specific details regarding 'Emily Pass et al.' using JWST to search for exomoons and being 'foiled by the star' are not corroborated by the provided web search or Wikipedia results. The evidence provided for this claim is generic or irrelevant to the specific scientific finding described.

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wikipedia NEUTRAL — Jared Taylor Isaacman (born February 11, 1983) is an American billionaire entrepreneur, pilot, and commercial astronaut who has served as the 15th administrator of NASA since December 2025. He is the …
https://en.wikipedia.org/wiki/Jared_Isaacman

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wikipedia NEUTRAL — LeBron Raymone James ( lə-BRON; born December 30, 1984) is an American professional basketball player for the Los Angeles Lakers of the National Basketball Association (NBA). Nicknamed "King James", h…
https://en.wikipedia.org/wiki/LeBron_James

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wikipedia NEUTRAL — This is a list of known objects which occupy, have occupied, or are planned to occupy any of the five Lagrange points of two-body systems in space.
https://en.wikipedia.org/wiki/List_of_objects_at_Lagrange_po…

+ 3 more evidence sources

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.