Hipòtesi nebular concebuda per Swedenborg el 1734.
Tenia el problema que el sol no gira, no té moment angular com els planetes, i per això es va pensar si venia de dos cossos separats.
[esborrany]
1950 Teories sobre l’origen del planeta i el sistema solar, a partir de dades de meteorits, models de nucleosíntesi a les estrelles.
[ completar wikipedia]
The standard model for the formation of the Solar System (including the Earth) is the solar nebula hypothesis.[23] In this model, the Solar System formed from a large, rotating cloud of interstellar dust and gas called the solar nebula. It was composed of hydrogen and helium created shortly after the Big Bang 13.8 Ga (billion years ago) and heavier elements ejected by supernovae. About 4.5 Ga, the nebula began a contraction that may have been triggered by the shock wave from a nearby supernova.[24] A shock wave would have also made the nebula rotate. As the cloud began to accelerate, its angular momentum, gravity, and inertia flattened it into a protoplanetary disk perpendicular to its axis of rotation. Small perturbations due to collisions and the angular momentum of other large debris created the means by which kilometer-sized protoplanets began to form, orbiting the nebular center.[