---
title: "Young Sun Swallowed a Planet 5–10 Times the Size of Earth: Scientists Find 'Fingerprints' of the Catastrophe Inside the Star"
description: "Turkish astronomers in MNRAS (2026) showed that the young Sun swallowed a planet with a mass of 5–10 Earth masses, leaving structural and chemical traces that explain helioseismological anomalies and the lithium deficit."
date: 2026-09-11T05:14:00.000Z
lang: en
url: https://xab.info/en/posts/young-sun-swallowed-super-earth-planet-fingerprints-of-catastrophe
tags: [sun, super-earth, stellar-evolution, helioseismology, lithium-depletion, planetary-accretion, mesa-modeling]
publisher: "XAB.info"
---

# Young Sun Swallowed a Planet 5–10 Times the Size of Earth: Scientists Find 'Fingerprints' of the Catastrophe Inside the Star

![Artist's reconstruction of a planet being engulfed by the young Sun: a star with orbital paths and a cloud of hot debris](https://xab.info/media/2026/09/11/molodoe-solnce-poglotilo-planetu-superzemlya-sledy-katastrofy/molodoe-solnce-poglotilo-planetu-superzemlya-sledy-katastrofy-1.webp)

## 🎯 Key Points

- The study in MNRAS (2026) suggests that the young Sun swallowed a planet with a mass of 5–10 Earth masses.
- The scenario simultaneously explains discrepancies in helioseismological data and the anomalous lithium deficit on the Sun's surface.
- MESA modeling shows that the planet passed through the outer layers and dissolved into the interior, leaving a chemical trace.
- The hypothesis explains the absence of super-Earths in the Solar System against their prevalence in other systems.
- The model's predictions can be verified using current and future helioseismological measurements.

Astronomers from Turkey published a study in the journal Monthly Notices of the Royal Astronomical Society proposing a hypothesis: in the early phase of its existence, the Sun swallowed a planet whose mass exceeded that of Earth by a factor of 5–10. According to their calculations, this event left chemical and structural 'fingerprints' in the star's interior, which persist to this day and can be verified using helioseismological measurements.

### An Unfinished Puzzle: What the Models Could Not Explain

For many years, standard physical models of stellar evolution have failed to fully reconcile theoretical predictions with actual seismic observations of the Sun. In particular, discrepancies were recorded in the speed of sound beneath the convective zone and in the depth of the convective zone itself. Meanwhile, the mystery of the anomalous depletion of lithium on the star's surface remained unsolved — its concentration turned out to be significantly lower than classical models predicted. The researchers suggested that both problems share common roots in the Sun's early chemical history.

### MESA Computer Modeling: How the Planet Dissolved Into the Star

Using the MESA stellar evolution modeling package, the scientists tested various scenarios of matter accretion and compared the results with actual observations. According to the model, the planet was able to pass through the star's outer layers, losing only a negligible fraction of its own mass, before dissolving completely into the interior. Because planets form from material that is chemically distinct from the gas of the protoplanetary disk, the absorption of such a solid body should have left a noticeable trace in the star's chemical composition and internal structure. The authors emphasize that the proposed scenario simultaneously explains both the peculiarities of the Sun's internal structure and the anomalously low concentration of lithium.

### Why the Solar System Has No Super-Earths

Astronomers have long wondered why large super-Earths are detected in many other stellar systems, yet are absent from the Solar System. Earlier hypotheses suggested that one or several such planets could have formed inside Mercury's orbit and then migrated inward through the gas disk toward the Sun. The new work by Turkish scientists goes further: it not only confirms the theoretical migration pathway but also points to the existence of direct physical evidence of such an event, which can now be tested with helioseismological measurements.

### Contradictory Data

In the headline of the RBC-Ukraine publication, which references the same study, the wording 'a planet 10 times larger than Earth' appears, whereas in the text of the scientific work itself and in the extended version of the report the range is given as 5–10 Earth masses. The difference between the upper bound of the range and the point value in the headline could mislead the reader about the precision of the estimate. Moreover, the source fraza.com, mentioned in the context, is devoted to the discovery of another super-Earth with potential conditions for life and is not a direct confirmation of the hypothesis about the Sun swallowing a planet; it is used only as general context about the prevalence of super-Earths in the Universe.

### What's Next: Verification Through Helioseismology

The key significance of the work lies in the fact that it moves the hypothesis from the realm of pure speculation into the domain of testable predictions. The authors note that helioseismological measurements, already being carried out within the framework of the Solar Orbiter mission and future projects, are capable of either detecting or refuting the predicted structural anomalies. If the data confirm the model, this will become the first direct evidence that the Sun once 'swallowed' planets, and will open a new class of archaeological evidence in heliophysics.

## 🔍 Fact-Check Verification

- [The Sun Destroyed a Planet 10 Times Larger Than Earth: How Is This Possible](https://www.rbc.ua/ukr/news/sontse-znishchilo-planetu-10-raziv-bilshu-1789049317.html) - Прямое отражение исследования MNRAS 2026: поглощение планеты, моделирование MESA, объяснение дефицита лития и сейсмических аномалий. Заголовок округляет массу до 10 масс Земли, тогда как текст указывает диапазон 5–10.
- [A Super-Earth Where Life May Exist Has Been Found](https://fraza.com/news/340070-najdena-superzemlja-na-kotoroj-mozhet-byt-zhizn) - Источник посвящён обнаружению другой экзопланеты-суперземли и не является прямым подтверждением гипотезы о поглощении планеты Солнцем. Использован исключительно как общий контекст о распространённости суперземель.

## ❓ FAQ

### Q: What planet, according to the hypothesis, was swallowed by the Sun?
**A:** According to MESA modeling, it was a planet with a mass of 5–10 Earth masses — so-called super-Earth. It probably formed inside Mercury's orbit and migrated toward the star in the early phase of the Solar System.

### Q: How did the scientists prove that the swallowing took place?
**A:** There are no direct observations, of course. However, computer modeling shows that the accretion of a solid body of such a mass simultaneously explains three anomalies: the discrepancy in the speed of sound beneath the convective zone, the depth of the convective zone, and the lithium deficit. The authors note that the model's predictions can be tested with helioseismological measurements.

### Q: Why are there no super-Earths in the Solar System, while other systems have them?
**A:** Astronomers believe that super-Earths could have formed in our system as well, but migrated toward the Sun and were swallowed. The new work adds a specific mechanism to this hypothesis and predicts physical traces that should be preserved in the star's interior.

### Q: When was the study published?
**A:** The work was published in Monthly Notices of the Royal Astronomical Society in 2026. RBC-Ukraine reported on it in September 2026.