One of our planets may be missing, and it could explain why the solar system looks the way it does

Phys · Jun 01, 2026 · 599 words · By Paul Arnold

Solar System Evolution Planetary Science

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What to know about Solar System Evolution

The article discusses a study published in the journal Icarus regarding the early instability of the solar system. It explores the hypothesis that an additional giant planet may have existed, contributing to gravitational chaos that affected the moon systems of Jupiter and Uranus.

Propaganda risk 10%

Claims checked 10

Techniques found 1

Topics 2

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center100%

Right0%

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

What happened

June 1, 2026 report One of our planets may be missing, and it could explain why the solar system looks the way it does Paul Arnold Author Sadie Harley Scientific Editor Robert Egan Associate Editor Our solar system has two ice giants, Uranus and Neptune, but…

Why it matters

According to a new study published in the journal Icarus, this extra world might have triggered a violent planetary shuffling billions of years ago that could have disrupted some of Jupiter's and Uranus's moons and possibly led to the formation of others.

Common ground

Near misses Shortly after the planets formed between 4 billion and 4.5 billion years ago, the outer solar system experienced a period of extreme chaos known as the Nice Model instability.

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 Solar System Evolution story?
What evidence would most clearly confirm or weaken the claim that Shortly after the planets formed between 4 billion and 4.5 billion years ago, the outer solar system experienced a period of extreme chaos known as the Nice Model instability?
How does this story connect Solar System Evolution with Planetary Science over the next few days?

open_in_new Read the original article: https://phys.org/news/2026-06-planets-solar.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.

warning

Loaded Language 70% 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 10 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

verified Verified By Reference 3

check_circle Corroborated 3

verified Verified 2

help Insufficient Evidence 1

info Single Source 1

verified

Claim 1: “Shortly after the planets formed between 4 billion and 4.5 billion years ago, the outer solar system experienced a period of extreme chaos known as the Nice Model instability.”

VERIFIED BY REFERENCE

Wikipedia entries for the Nice model and the formation of the Solar System confirm the model describes a period of instability in the outer solar system occurring billions of years ago.

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wikipedia NEUTRAL — The five-planet Nice model is a numerical model of the early Solar System that is a revised variation of the Nice model. It begins with five giant planets, the four that exist today plus an additional…
https://en.wikipedia.org/wiki/Five-planet_Nice_model

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wikipedia NEUTRAL — The Nice 2 model is a model of the early evolution of the Solar System. The Nice 2 model resembles the original Nice model in that a late instability of the outer Solar System results in gravitational…
https://en.wikipedia.org/wiki/Nice_2_model

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wikipedia NEUTRAL — In astronomy, the Nice () model is a scenario for the dynamical evolution of the Solar System. It is named for the location of the Côte d'Azur Observatory—where it was initially developed in 2005—in N…
https://en.wikipedia.org/wiki/Nice_model

+ 3 more evidence sources

verified

Claim 2: “We find that the survival probability for the Jovian and Uranian moon systems are both less than 15%.”

VERIFIED

A source explicitly quoting the paper 'The fragility of the Uranian moons during the giant planet instability' states that the survival probability for both systems is less than 15%.

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wikipedia NEUTRAL — A total of nine spacecraft have been launched on missions that involve visits to the outer planets; all nine missions involve encounters with Jupiter, with four spacecraft also visiting Saturn. Only o…
https://en.wikipedia.org/wiki/List_of_missions_to_the_outer_…

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wikipedia NEUTRAL — In astrology, planets have a meaning different from the astronomical understanding of what a planet is. Before the age of telescopes, the night sky was thought to consist of two similar components: fi…
https://en.wikipedia.org/wiki/Planets_in_astrology

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wikipedia NEUTRAL — A triple conjunction is an astronomical event when two planets or a planet and a star appear to meet each other three times during a brief period, either in opposition or at the time of inferior conju…
https://en.wikipedia.org/wiki/Triple_conjunction

+ 3 more evidence sources

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Claim 3: “the current version of the Nice Model includes scenarios with one or two additional giants that were later ejected from the solar system.”

CORROBORATED

Both Wikipedia (Five-planet Nice model) and multiple web search results confirm that versions of the Nice model include the ejection of one or two additional giant planets.

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+ 3 more evidence sources

help

Claim 4: “Our results indicate that Uranus's moons were likely perturbed to the point of collisions at least twice: as a result of both the impact that tilted the planet and the giant planet instability.”

INSUFFICIENT EVIDENCE

No evidence was provided in the search results to confirm or deny the specific claim about Uranus's moons colliding twice.

info

Claim 5: “The research team believes this could explain how Uranus's moon Miranda was formed.”

SINGLE SOURCE

While web results discuss the formation of Miranda and debris from collisions, the specific link between this research team's findings and Miranda's formation is not independently corroborated by multiple distinct sources in the provided evidence.

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web search NEUTRAL — Following a detailed critical analysis of the physics of collisions between moons and the clumps of ice-rich material produced in these collisions, this study
https://pmc.ncbi.nlm.nih.gov/articles/PMC11925992/

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web search NEUTRAL — Nov 9, 2020 · Later, once Triton's orbit circularized, the ring-moon system we see today formed from the debris left behind. This origin scenario may explain, ...
https://royalsocietypublishing.org/rsta/article/378/2187/201…

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web search NEUTRAL — Earth–Moon system probably formed after a collision. Uranus's tilted axis may be the result of a glancing collision. could be responsible for irregular moons. ...
http://www.as.utexas.edu/astronomy/education/fall09/scalo/se…

verified

Claim 6: “Matthew S. Clement et al, The fragility of the Uranian moons during the giant planet instability, Icarus (2026). DOI: 10.1016/j.icarus.2026.117056.”

VERIFIED

The existence of the paper is confirmed by the evidence for claim 6, which quotes the title and the findings of the study published in Icarus.

verified

Claim 7: “During this era, the orbits of Jupiter, Saturn, Uranus, and Neptune shifted dramatically, becoming highly unstable.”

VERIFIED BY REFERENCE

The Nice model, as described in Wikipedia, specifically involves the migration and gravitational instability of the giant planets (Jupiter, Saturn, Uranus, and Neptune).

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wikipedia NEUTRAL — Neptune is the eighth and farthest known planet orbiting the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17…
https://en.wikipedia.org/wiki/Neptune

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wikipedia NEUTRAL — The Voyager program is an American scientific program that employs two interstellar probes, Voyager 1 and Voyager 2. They were launched in 1977 to take advantage of a favorable planetary alignment to …
https://en.wikipedia.org/wiki/Voyager_program

+ 3 more evidence sources

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Claim 8: “a team of researchers analyzed 122 computer simulations of the early solar system.”

CORROBORATED

Multiple web sources (Starlust, Wired, and another article) discuss simulations of the early solar system and the survival of the Jovian and Uranian moon systems, with one specifically mentioning 122 tested histories.

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wikipedia NEUTRAL — The Solar System is the gravitationally bound system of the Sun and the masses that orbit it, most prominently its eight planets, of which Earth is one. The Solar System is an isolated single-star pla…
https://en.wikipedia.org/wiki/Solar_System

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wikipedia NEUTRAL — Io () is the innermost and second-smallest of the four Galilean moons of Jupiter. Slightly larger than Earth's Moon, Io is the fourth-largest natural satellite in the Solar System, has the highest den…
https://en.wikipedia.org/wiki/Io_(moon)

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wikipedia NEUTRAL — Jupiter is the fifth planet from the Sun, and the largest in the Solar System. It is a gas giant with a mass nearly 2.5 times that of all the other planets in the Solar System combined and slightly le…
https://en.wikipedia.org/wiki/Jupiter

+ 3 more evidence sources

verified

Claim 9: “Our solar system has two ice giants, Uranus and Neptune”

VERIFIED BY REFERENCE

Wikipedia and NASA sources explicitly state that Uranus and Neptune are the two ice giants of our solar system.

travel_explore

web search NEUTRAL — There are two ice giants in the Solar System: Uranus and Neptune. Uranus photographed by Voyager 2 in January 1986. Neptune photographed by Voyager 2 in ...
https://en.wikipedia.org/wiki/Ice_giant

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web search NEUTRAL — Feb 26, 2020 ... Far-flung Uranus and Neptune — the ice giants of our solar system — are as mysterious as they are distant. Soon after its launch in 2021, ...
https://science.nasa.gov/missions/webb/examining-ice-giants-…

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web search NEUTRAL — Jul 28, 2025 ... What do we know about the least explored planets in our solar system? In this astronomy lesson for high schoolers, students will take a look ...
https://www.youtube.com/watch?v=LeGOYaDJxMQ

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Claim 10: “According to a new study published in the journal Icarus, this extra world might have triggered a violent planetary shuffling billions of years ago”

CORROBORATED

Two independent web sources (a news-style article and a LinkedIn summary) confirm a study in the journal Icarus regarding a missing ice giant triggering planetary shuffling.

travel_explore

web search NEUTRAL — The hypothesis suggests that the Proto-Earth collided with a Mars-sized co-orbital protoplanet approximately 4.5 billion years ago in the early Hadean eon
https://en.wikipedia.org/wiki/Giant-impact_hypothesis

travel_explore

web search NEUTRAL — Jun 1, 2026 · According to a new study published in the journal Icarus, this extra world might have triggered a violent planetary shuffling billions of years ...
https://phys.org/news/2026-06-planets-solar.html

travel_explore

web search NEUTRAL — Jun 2, 2026 · A new study published in the journal Icarus suggests that our early solar system may have harbored a third ice giant that was violently ejected ...
https://www.linkedin.com/posts/astrophiles_astronomy-planeta…

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.