Image Source: Space
Super Earth worlds are common in other planetary systems, yet our solar system has no known planet of this type. A new study suggests there may be a dramatic reason: the young Sun could have swallowed one billions of years ago, leaving evidence hidden deep within its interior.
The research, led by Mutlu Yildiz of Ege University in Turkey, proposes that a planet several times more massive than Earth may have migrated toward the infant Sun before being consumed. Although the idea remains theoretical, computer models indicate that such an event could help explain several long-standing differences between observations of the Sun and standard models of stellar evolution.
A Powerful New Clue About a Missing Super Earth
Super-Earths are planets larger than Earth but smaller than ice giants such as Neptune. They are among the most frequently detected types of exoplanets beyond our solar system. Their absence from the region close to the Sun has puzzled scientists, particularly because planetary formation models suggest that one or more such worlds could have formed near the orbit of Mercury.
According to the new study, these planets may have moved through the young Sun’s surrounding protoplanetary disk. This flattened cloud of gas and dust supplied material for the planets and the star itself. As gravitational interactions changed the planet’s orbit, it could have spiraled inward and eventually collided with the Sun.
Using advanced stellar evolution software, Yildiz and colleagues tested different planetary engulfment scenarios. Their calculations found that the best match for the Sun’s current characteristics involved a planet with between five and ten times the mass of Earth.
“We thought planetary engulfment might affect the solar structure but did not expect the calculations to converge on such a specific super-Earth mass range,” Yildiz said in a statement. He described that result as one of the most interesting outcomes of the research.
What the Sun’s Hidden Evidence Could Reveal
The scientists focused on several unusual features of the Sun. These include the depth of its convection zone and the structure of sound speeds just beneath that region. The convection zone is the layer where hot material rises toward the surface, cools and sinks again. Its precise properties can be measured using helioseismology, which studies vibrations traveling through the Sun.
The study also examines the Sun’s low abundance of lithium at its surface. Standard models have struggled to fully explain why the Sun contains less lithium than expected. A swallowed planet could have changed the chemical balance inside the young star and helped produce the conditions seen today.
“By modelling the Sun’s evolution and comparing the results with precise observations of its interior, we find that the ingestion of a super-Earth could help explain long-standing differences between standard solar models and observations,” Yildiz said.
- The possible planet may have been five to ten times more massive than Earth.
- It could have formed near the young Sun before migrating inward.
- Its remains may have altered the Sun’s internal chemistry.
- The event could help explain depleted lithium and unusual solar structure.
Scientists Warn the Theory Is Not Yet Proven
Despite the intriguing results, researchers have not directly detected the remains of a swallowed planet. The study is based on computer modeling and comparisons with known solar properties. Other processes may also account for the discrepancies in the Sun’s interior and its lithium content.
Importantly, the model does not require the entire planet to have been engulfed. A planetary encounter with the Sun could have produced some of the predicted effects while allowing part of the world to survive or escape. That possibility adds complexity to a story that already challenges the traditional picture of the solar system’s early development.
The researchers believe that a planetary meal could leave structural and chemical fingerprints that remain detectable today. The next step is to determine whether independent observations can identify those signatures inside the Sun.
A Surprising Chapter in Solar System Formation
If confirmed, the discovery would reshape scientists’ understanding of how the solar system formed. It would suggest that the Sun’s early environment was more chaotic than it appears now, with planets migrating across unstable orbits and sometimes being destroyed by their parent star.
It could also explain why the solar system lacks a nearby super Earth, despite these planets being so common around other stars. Rather than never forming, one may have existed briefly before becoming part of the Sun itself.
The research was published on September 10, 2026, in Monthly Notices of the Royal Astronomical Society. For now, the Sun’s alleged planetary feast remains an exciting possibility—but one that future studies may be able to test by examining the star’s hidden interior in greater detail.
Frequently Asked Questions
What is a super Earth?
A super Earth is a planet more massive than Earth but generally less massive than Neptune. The name describes size and mass, not whether the planet is habitable or Earth-like.
Did the Sun definitely swallow a super Earth?
No. The idea is based on stellar evolution modeling and unexplained solar characteristics. Researchers say further observations are needed to confirm whether the Sun contains evidence of planetary engulfment.
How large could the swallowed planet have been?
The model’s best results involved a planet between five and ten times the mass of Earth.
What evidence might remain inside the Sun?
Scientists are looking for chemical and structural fingerprints, including changes related to the Sun’s lithium abundance, convection zone and internal sound-speed profile.
