jule gregory charney developed the modern model of the solar nebular disk instability model.
jule gregory charney developed the modern model of the solar nebular disk instability model.
who developed the modern model of the solar nebular disk instability model?
jule gregory charney
the birth of the modern widely accepted theory of planetary formation—the solar nebular disk model (sndm)—can be traced to the works of soviet astronomer victor safronov. his book "evolution of the protoplanetary cloud and formation of the earth and the planets", which was translated to english in 1972, had a long-lasting effect on the way scientists thought about the formation of the planets. in this book almost all major problems of the planetary formation process were formulated and some of them solved. safronov's ideas were further developed in the works of george wetherill, who discovered "runaway accretion". by the early 1980s, the nebular hypothesis in the form of sndm had come back into favour, led by two major discoveries in astronomy. first, a number of apparently young stars, such as beta pictoris, were found to be surrounded by discs of cool dust, much as was predicted by the nebular hypothesis. second, the infrared astronomical satellite, launched in 1983, observed that many stars had an excess of infrared radiation that could be explained if they were orbited by discs of cooler material.
history of solar system formation and evolution hypotheses
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 that the solar system is formed from the nebulous material. the theory was developed by immanuel kant and published in his "allgemeine naturgeschichte und theorie des himmels" ("universal natural history and theory of the heavens"), published in 1755. originally applied to the solar system, the process of planetary system formation is now thought to be at work throughout the universe. the widely accepted modern variant of the nebular hypothesis is the solar nebular disk model (sndm) or solar nebular model. it offered 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. some elements of the original nebular hypothesis are echoed in modern theories of planetary formation, but most elements have been superseded.
nebular hypothesis