Nebular hypothesis
The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System. The theory was developed by Immanuel Kant and published in his Allgemeine Naturgeschichte und Theorie des Himmels in 1755. It was the most popular model of planet formation at the start of the 19th century, but it was superseded by the more detailed Laplacian model.
About Nebular hypothesis in brief
The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System. The theory was developed by Immanuel Kant and published in his Allgemeine Naturgeschichte und Theorie des Himmels in 1755. Pierre-Simon Laplace independently developed and proposed a similar model in 1796 in his Exposition du systeme du monde. Some elements of the original nebular theory are echoed in modern theories of planetary formation, but most elements have been superseded. The main problem involved the distribution of angular momentum between the Sun and planets. The planets have 99% of the angular momentum of the Sun, and this could not be explained by the nebular model. As a result, astronomers largely abandoned this planet formation theory at the beginning of the 20th century. The process of planetary system formation is now thought to be at work throughout the universe. It is thought to occur beyond the frost line, where planetary embryos mainly are made of various types of ice. The last stage takes approximately 100 million to a billion years. The formation of giant planets is a more complicated process, where they are several times more massive than in the inner part of the protoplanetary disk. The accretion stops when the gas is exhausted. The formed planets can migrate over long distances during or after their formation. Ice giants such as Uranus and Neptune are thought to have failed cores, which formed too late when the disk had almost disappeared. The Sun originally had an extended protosolar cloud that contracted and cooled, throwing off material; and according to him, according to this material, planets condensed from this material.
He envisioned that the Sun originally an extended hot cloud that had contracted and cooling, and threw off more and more material; this was the protos solar nebula. This model featured a series of gaseous rings of rings of material; according to Kant, the planets condensed and condensed from this material; and according to Laplace, this material condensed from the planets. It was the most popular model of planet formation at the start of the 19th century, but it was superseded by the more detailed Laplacian model. The widely accepted modern variant is the solar nebular disk model or solar nebularity model. It offers explanations for a variety of properties of the Solar System, including the nearly circular and coplanar orbits of the planets, and their motion in the same direction as the Sun’s rotation. It also suggests that the Solar System formed from gas and dust orbiting the Sun. A Sun-like star usually takes approximately 1 million years to form, with the proto-planetary disk evolving into a planetary system over the next 10–100 million years. This may give birth to planets in certain circumstances, which are not well known, which is not well understood by astronomers. The formation of planetary systems is thought to be a natural result of star formation. It occurs after the frost line, when planetary embryos go through a stage of violent mergers.
You want to know more about Nebular hypothesis?
This page is based on the article Nebular hypothesis published in Wikipedia (as of Dec. 06, 2020) and was automatically summarized using artificial intelligence.
