The new theory, the authors believe, explains the differences in the chemical and isotopic composition of bodies of the inner and outer
The work may also explain why internalthe planets of the Solar System are small and have little water, while the outer planets of the Solar System are larger and have vast reserves of water.
According to scientists, the fact is that the inner terrestrial protoplanets accreted early and were heated from the inside by strong radioactive decay: this dried them out and separated the dry layers from the wet ones.
The outer protoplanets began accretion later and withless radiogenic heating, so they retained most of their volatiles initially captured from the protoplanetary cloud. Thus, the inner and outer parts of the solar system at the earliest stage of their history followed two different evolutionary paths.
Different time intervals for the formation of twopopulations of planetesimals mean that their internal heat engines of radioactive decay differ significantly. The planetesimals of the inner Solar System quickly became very hot, forming internal magma oceans, iron cores, and outgassing, eventually leading to the formation of dry planets. In comparison, the outer planetesimals of the Solar System formed later and therefore experienced substantially less internal heating and therefore limited iron core formation and volatile release.
Tim Lichtenberg, doctor and lead author of the study
Scientists note that the theoretical basis of the model is based on the latest observations of other planetary systems during their formation and the study of meteorites.
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