Earth’s Fate Altered: How Jupiter’s Arrival Prevented Our Planet from Sinking into the Sun

Everything suggests that planetary formation is too fragile a balance to last. The laws of physics impose forces that tend to disorganize rather than build. Yet something kept the Earth away from the solar inferno, even though everything was pushing it. This mystery of stability in the midst of chaos resurfaces in revised theories of the formation of the solar system, where a massive actor may have quietly changed the course of history.

When everything should have collapsed

The beginnings of the solar system were not a quiet miracle. Collapsed under its own gravity, an immense cloud of gas and dust gave birth to our star. Around it, a rotating disk was formed, the gestation ground for future planets. But this record was not a peaceful cradle. It worked like a trap.

The first rock structures (the planetesimals) underwent a phenomenon feared by astrophysicists, called radial drift. Interacting with the ambient gas, these bodies, one kilometer in diameter, lost energy and inexorably approached the Sun. This process should have doomed the embryos of Mercury, Venus, Mars… and the Earth, by throwing them into a death spiral.

Observations made by the ALMA radio telescope in Chile, which scans disks around other stars, reinforce this hypothesis. In the majority of cases, these structures offer no guarantee of stability for the internal planets. This is what New Atlas points out, based on comparisons made by the Rice University team.

How the formation of the solar system bifurcated

However, this disaster scenario never came true. And the key to this anomaly lies in the hasty birth of Jupiter. According to numerical simulations published in Science Advances in October 2025, the gas giant quickly reached critical mass. As it grew, it opened a breach in the gas disk, modifying its structure and creating areas of overpressure.

These density “bumps”, acting as gravitational dams, stopped the fall of solid materials towards the star. Better still, they trapped dust and debris, providing new homes for planetary formation. The rocky embryos, slowed down in their migration, were able to anchor themselves in stable orbits, particularly around the astronomical unit (the Earth-Sun distance). A collateral effect which froze Venus, Earth and Mars in habitable zones.

Jupiter therefore played a dual role. By interrupting the flow of material towards the center of the disk, it protected the forming planets. But it also caused a reorganization of the entire system, by isolating the internal regions from the supply of materials from colder areas. It is this early partitioning which today explains the chemical duality of meteorites falling on Earth.

What meteorites still tell us today

Because this story is not a simple modeled speculation. It is inscribed in the matter that the Earth still receives. Certain meteorites, called chondritic, bear the trace of this disrupted chronology. Unlike the first solid structures in the solar system, formed in the very first million years, these objects appeared much later, between two and three million years after the creation of the first solid inclusions (CAI).

This offbeat training poses a paradox. How could planetesimals appear so late, in a region supposed to have been emptied of dust? The explanation put forward by the Rice researchers lies in the dynamics imposed by Jupiter. By reshaping the disk and accelerating the dissipation of gas, the giant planet allowed the local accumulation of debris from planetary collisions. These materials then gave rise to a second generation of bodies, giving rise to non-carbonaceous meteorites.

For André Izidoro, co-author of the study and professor at Rice University, these objects are “like time capsules from the early solar system“. Their existence confirms that the formation of the solar system did not happen all at once, but that it was punctuated by events of cosmic magnitude. And at the center of this orchestration, Jupiter has not only grown, it has shaped the conditions of existence of our planet.