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The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems). It suggests the Solar System is formed from gas and dust orbiting the Sun which clumped up together to form the planets.
In 1905, Chamberlin and Forest Ray Moulton developed a theory of the formation of the Solar System that challenged the Laplacian nebular hypothesis. Their theory, the Chamberlin-Moulton planetesimal hypothesis , received favorable support for almost a third of a century, but passed out of favor by the late 1930s.
The refined nebular model was developed entirely on observations of the Solar System because it was the only one known until the mid-1990s. It was not confidently assumed to be widely applicable to other planetary systems , although scientists were anxious to test the nebular model by finding protoplanetary discs or even planets around other ...
The nebular hypothesis says that the Solar System formed from the gravitational collapse of a fragment of a giant molecular cloud, [9] most likely at the edge of a Wolf-Rayet bubble. [10] The cloud was about 20 parsecs (65 light years) across, [9] while the fragments were roughly 1 parsec (three and a quarter light-years) across. [11]
He restated and developed the nebular hypothesis of the origin of the Solar System and was one of the first scientists to suggest an idea similar to that of a black hole, [4] with Stephen Hawking stating that "Laplace essentially predicted the existence of black holes". [1] He originated Laplace's demon, which is a hypothetical all-predicting ...
It suggests that everything currently in existence has developed from earlier forms: solar system, Earth, rocks, plants and corals, fish, land plants, reptiles and birds, mammals, and ultimately man. The book begins by tackling the origins of the solar system, using the nebular hypothesis to explain its formation entirely in terms of natural law.
The Chamberlin–Moulton planetesimal hypothesis was proposed in 1905 by geologist Thomas Chrowder Chamberlin and astronomer Forest Ray Moulton to describe the formation of the Solar System. It was proposed as a replacement for the Laplacian version of the nebular hypothesis that had prevailed since the 19th century.
Given this, Crick and Orgel argued that experimental evidence required to validate one theory over the other was lacking. [47] That being said, evidence strongly in favor of abiogenesis over panspermia exists today [ citation needed ] , whereas evidence for panspermia, particularly directed panspermia, is decidedly lacking.