What can disprove the solar nebula theory hypothesis?
Although the nebula theory is widely accepted, there are some exceptions to that theory that scientists simply have no for. The three exceptions to the nebula theory are Uranus, Neptune, and the Kuiper Belt. According to the nebula theory, the inner planets formed when metals condensed into the inner planets, and the gas giant, Jupter and Saturn, formed when gasses condensed. However, because of the gravitational snowball effect due to the masses of Jupiter and Saturn, there simply should not have been enough gas for Uranus and Neptune to form according to the nebula theory. Also, all the rocky particles should have condensed to form the inner planets, so there should not be a belt like the Kuiper belt at all past Neptune. But there is, which contradics the nebula theory.
