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Nebula-planetesimal program thoughts (planetesimals…
Nebula-planetesimal program thoughts 
planetesimals
impact
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material excavated and ejected back to nebula #
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water - rock reactions
gas formation
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explosive decompression of planetesimal #
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Outside influences. The model acts as the nebula is an isolated system. But energy from outside may enter the system. Materials as well. Difficult to gauge scale of such influence (perhaps it is a good proxy to assume that the planetary nebula-Sun system is isolated from the local environment)
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Injection of material from local events (e.g., other stars' outflow, supernova event)
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