The solar system’s planet factory

Just outside Jupiter”s orbit, a ring-shaped region of high gas pressure formed. In this “dust trap,? over several million years planetesimals of varying compositions were able to form. Credit: MPS / hormesdesign.de

doi.org/10.3847/1538-4357/ae6104
Credibility: 989
#Planets

Scientists have just identified one of the most important regions for planet formation in our Solar System, located just beyond Jupiter’s orbit

This discovery reveals how the primordial Solar System functioned as a veritable “factory” of rocky bodies, producing materials with varied compositions over millions of years.

Initially, the young Sun was surrounded by a vast disk of gas and dust.

Tiny particles collided and merged, forming larger bodies called planetesimals.

Some of these bodies grew into planets, while others gave rise to the asteroids we know today.

Researchers have always suspected that this process was neither uniform nor organized, but rather chaotic, with different parts of the disk evolving in distinct ways simultaneously.

A team from the Max Planck Institute for Solar System Research in Germany conducted advanced computer simulations and concluded that a ring-shaped area just beyond Jupiter’s orbit acted as a particularly efficient and versatile location for the creation of these planetesimals.

This region, known as a “dust trap,” arose due to the influence of the gas giant.

Jupiter swept away much of the material near its orbit, creating a gap in the disk and a high-pressure zone of gas just beyond it.

The dust that wandered through the disk became trapped there, accumulating in large quantities and forming clumps called pebbles, which later transformed into planetesimals.

The study, published in The Astrophysical Journal, shows that, over about two million years, this same region generated planetesimals with very different compositions.

Initially, one type of material predominated, then the mixture changed, resulting in distinct generations of celestial bodies.

Joanna Dr”?kowska, leader of the research group, explains that different types of planetesimals formed in the same location of the primordial disk, but at different times, thanks to the excellent conditions offered by this dust trap.

Different groups of carbonaceous chondrites (here CO, CV, CM, TL, CI, and CR) can be traced back to different generations of planetesimals that formed over the course of about two million years. They differ in their proportions of fine-grained material (shown here in blue) and inclusions (shown here in brown). Credit: MPS / hormesdesign.de

The simulations accurately reproduced the results of laboratory analyses of meteorites found on Earth, serving as an important validation for theories of planetary formation.

Thorsten Kleine, director of the institute and cosmochemist, highlights that, for the first time, computer simulations of the early Solar System have been able to accurately explain what meteorites reveal in the laboratory.

These meteorites act as a “touchstone” for understanding how planets formed.

The researchers focused on carbonaceous chondrites, a type of carbon-rich meteorite that originated beyond Jupiter.

These meteorites vary considerably: some are fragile, composed mainly of fine, powdery material that easily disintegrates, while others are more resistant and contain visible inclusions embedded in the finer matrix.

The simulations showed that these materials correspond to two different substances present in the young disk: delicate dust and more stable clumps that initially formed in warmer regions and then spread out.

Nerea Gurrutxaga, first author of the article and doctoral student, emphasizes the importance of modeling the behavior and interaction of these materials on both small and large scales.

The simulations tracked collisions between individual particles and large-scale movement through the gas disk.

Jupiter served as a stronger barrier for larger, more resistant particles than for fine dust grains.

Over time, as new planetesimals formed and consumed available material, the proportion of components changed, generating distinct populations.

Carbonaceous chondrites can look very different. Some, such as the Allende meteorite shown here, contain a high proportion of clearly recognizable inclusions. – Credit: MPS / T. Klawunn

In the first 500,000 years, the amount of fragile material initially decreased and then increased over the following million years.

This resulted in two main populations of planetesimals: one rich in delicate material and another dominated by more stable matter.

Scientists believe that even older meteorites may have originated in the same dust trap.

This discovery reinforces the idea that dust traps were the preferred nurseries of planetesimals in the Solar System.

Understanding these processes helps explain not only the formation of our planets, but also the diversity of asteroids and meteorites that still reach Earth, providing valuable clues about the history of our corner of the Universe.

The study opens new doors to understanding how planetary systems develop around other stars, showing that planetary formation is a dynamic process, influenced by gas giants like Jupiter, which shape the environment around them.

This “original planet factory” demonstrates the complexity and beauty of the origin of our Solar System, where a simple pressure ring in the primordial disk was able to produce an impressive variety of materials over time.

Published in 05/31/2026 03h15

Portuguese version

Text adapted by AI (Grok) and translated via Google API in the English version. Images from public image libraries or credits in the caption. Information about DOI, author and institution can be found in the body of the article.

Reference article:

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