<P> In American astronomer Alastair G.W. Cameron's hypothesis (from 1962 and 1963), the protosun has a mass of about 1 - 2 Suns with a diameter of around 100,000 AU is gravitationally unstable, collapses, and breaks up into smaller subunits . The magnetic field is of the order of 1 / 100,000 gauss . During the collapse the magnetic lines of force are twisted . The collapse is fast and is done by the dissociation of H molecules followed by the ionization of H and the double ionization of He . Angular momentum leads to rotational instability which produces a Laplacean disk . At this stage radiation will remove excess energy and the disk will be quite cool in a relatively short period (about 1 mln . yrs .) and the condensation into what Whipple calls cometismals takes place . Aggregation of these produces giant planets which in turn produce disks during their formation from which evolve into lunar systems . The formation of terrestrial planets, comets, and asteroids involved disintegration, heating, melting, solidification, etc . He also formulated the Big Splat or Giant Impactor Hypothesis for the origin of the Moon . </P> <P> The capture theory, proposed by M.M. Woolfson in 1964, posits that the Solar System formed from tidal interactions between the Sun and a low - density protostar . The Sun's gravity would have drawn material from the diffuse atmosphere of the protostar, which would then have collapsed to form the planets . However, the capture theory predicts a different age for the Sun than for the planets, whereas the similar ages of the Sun and the rest of the Solar System indicate that they formed at roughly the same time . </P> <P> As captured planets would have initially eccentric orbits Dormand and Woolfson in 1974 and 1977 and Woolfson proposed the possibility of a collision . A filament is thrown out by a passing proto - star which is captured by the Sun and planets form from it . In this there were 6 original planets, corresponding to 6 point - masses in the filament, with planets A and B, the 2 innermost, colliding, the former at twice the mass of Neptune, and ejecting out of the Solar System, and the latter at 1 / 3 the mass of Uranus, and splitting into Earth and Venus . Mars and the Moon are former moons of A. Mercury is either a fragment of B or an escaped moon of A . The collision also produced the asteroid belt and the comets . </P> <P> T.J.J. See was an American astronomer and Navy Captain who at one time worked under Ellery Hale at the Lowell Observatory . He had a cult following largely because of his many (some 60) articles in Popular Astronomy but also in Astronomische Nachrichte (Astronomical News) (mostly in English). While at the USNO's Mare Island, Cal . station, he developed a model which he called capture theory, published in 1910, in his "Researches on the Evolution of the Stellar Systems: v. 2 . The capture theory of cosmical evolution, founded on dynamical principles and illustrated by phenomena observed in the spiral nebulae, the planetary system, the double and multiple stars and clusters and the star - clouds of the Milky Way", which proposed that the planets formed in the outer Solar System and were captured by the Sun; the moons were formed in thus manner and were captured by the planets . This caused a feud with Forest Moulton, who co-developed the planetesimal hypothesis . A preview was presented in 1909 at a meeting of the ASP (Astronomical Society of the Pacific) at the Chabot Observatory in Oakland, Cal., and newspaper headlines blared "Prof. See's Paper Causes Sensation" (San Francisco Call) and "Scientists in Furore Over Nebulae" (San Francisco Examiner). Our current knowledge of dynamics makes capture most unlikely as it requires special conditions . </P>

Describe how our current knowledge of the solar system developed