Who developed the modern model of the solar nebular disk instability model?
The birth of the modern widely accepted theory of planetary formation—the solar nebular disk model (SNDM)—can be traced to the Soviet astronomer Victor Safronov. His 1969 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 think 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". While originally applied only to the Solar System, the SNDM was subsequently thought by theorists to be at work throughout the Universe; as of astronomers have discovered extrasolar planets in our galaxy.
Who is thought to have developed the modern model of the solar nebular disk instability model?
Soviet astronomer Victor Safronov Victor Safronov
Nebular hypothesis
No context provided
Which geologist developed a planetesimal hypothesis that was a precursor to the modern model of the solar nebular disk?
Thomas Chrowder Chamberlin
No context provided
Which astronomer developed a planetesimal hypothesis in 1905 that was a precursor to the modern model of the solar nebular disk?
Forest Ray Moulton
Planetesimal
https://en.wikipedia.org/wiki/Planetesimal
Viktor Safronov
https://en.wikipedia.org/wiki/Viktor%20Safronov
Nebular hypothesis
https://en.wikipedia.org/wiki/Nebular%20hypothesis
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.
Chamberlin–Moulton planetesimal hypothesis
Soviet astronomer Victor Safronov is credited with the creation of the widely-accepted modern theory of planetary formation known as the solar nebular disk model, or SNDM. Though Safronov published his work in 1969, the precursor to his model was developed in 1905 with the planetismal hypothesis of the formation of the Solar System proposed by geologist Thomas Chrowder Chamberlin and astronomer Forest Ray Moulton.