For almost 3 centuries now the Nebular Hypothesis and Planetesimal Theory have become the preeminent explanations for how the Solar System and Planets evolved. Yet there is still no explanation for how Comets and Moons occur in the Solar System, and the Planetary explanation is still considered Theory. Is it possible that they are not correct? Yet since they hold such wide acceptance are actually preventing the discovery of how Comets, Moons, and Planets originate in a Solar System in an all inclusive explanation.
closed as primarily opinion-based by TildalWave, UV-D, Francesco Montesano, MBR, Donald.McLean♦ Oct 28 '13 at 11:45
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TidalWave says it perfectly:
The nebular hypothesis is simply the best model that fits our observations - that's how the scientific method works. In the last decade, we have been discovering and analysing increasing numbers of planetary and protoplanetary systems. Our models of the formation of these systems are continually refined as both our observations improve and our computing power increases.
You're insulting them, by asking them to justify why the work they base their livelihood upon isn't a load of rubbish.
You cannot justifiably criticize an accepted scientific theory without coming up with an equally plausible idea (unless you manage to prove that something is wrong). And unless someone does come up with a better idea, the nebular theory will continue to expand and evolve to better match our observations. That is the scientific process.