I believe the question remains open at this time. But at any rate, a good model of Solar System formation must allow rapid formation of planetary material. To Be Explained 1. All the planet's orbits lie roughly in the same plane, referred to as the ecliptic plane. The Sun's rotational equator co-incides with this plane.
Planetary orbits are nearly circular.
The planets contain much more of the net angular momentum of the Solar System. The distances between the planets mostly obey the simple Bode's Rule. To apply Bode's rule, one simply writes down a sequence of 4's, one for each planet and the asteroid belt, except Neptune. One astronomical unit is the mean distance of the Earth from the Sun. This rule was developed in 1772 by Johann Bode and lacked any theoretical justification at the time.