Scientist explain growth crisis of Jupiter

For two million years, Jupiter grew slowly, according to studies on meteorites.

Jupiter is the largest planet in our solar system, but for a while, it has had growth problems. Swiss researchers have clarified this mystery, announced Monday the University of Bern in a statement.

For two million years, Jupiter grew slowly, according to studies on meteorites. A phenomenon that astronomers from the Universities of Berne and Zurich and ETH Zurich have tried to understand. Using a new model, they traced the origin of the gas giant and solved the mystery.

We were able to show that Jupiter has grown through different phases, says Julia Venturini from the University of Zurich, which summarizes the results she and her colleagues have published in the journal Nature Astronomy. During these phases, the mass of Jupiter did not develop uniformly.

In the beginning, the planet embryo collected small pebbles of only a few centimeters and rapidly formed a planetary nucleus during the first million years, explains the University of Bern. In the second phase, during the next two million years, the growth of the planet has progressed more slowly.

Collisions with one-kilometer diameter blocks then only slowly added more mass but provided a lot of energy, which was even more important.

Collisions with these blocks released heat. This heat warmed the gaseous atmosphere of the young planet, preventing rapid cooling, contraction and further enrichment of the gas. This explains the relatively long time that Jupiter spent in the mass phase from 15 to 50 times that of the Earth, as the researchers explain.

It was not until the third phase that the gases finally accumulated and made Jupiter a gaseous giant about 300 times the mass of the earth and about 143,000 kilometers in diameter.

The study was inspired by new data on meteorites, says the University of Bern. These showed that the young solar system, while still a disk of dust and gas, was divided into two regions. Jupiter then served as a barrier of separation between the two.

For two million years, when Jupiter went from 20 to 50 times the mass of earth, it apparently disrupted the dust disk and had to create a seal. Materials outside its orbit could not mix with those inside its orbit. This separation lasted until Jupiter reached a mass sufficient to deflect the rock and disperse it into the inner regions of the solar system.