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The notion of rocks coalescing in space to form planets is very contentious.
Where are your links to the references which make this claim? (the claim that rocks stick together to form planetesimals)
I was being a bit off the cuff in my temperature estimation but, I was really implying that you need a lot of actual energy - not just at the centre but over most of the volume of the planet whilst forming. Without an excess of energy, I don't reckon the process would get established In any case, my main point was that there is a 'critical mass', below which a load of material would be just as likely to break up again into smaller bits as a result of another impact.My main issue is with the mysticists who, without examining (or understanding, often) the conventional explanations for these phenomena, insist that there must be something else at work which lies outside our present understanding. What sort of Science is that? A separate rule for every new thing we observe, in an attempt to understand the Universe? It wouldn't be worth even starting to try.