Corrected entry: When Chakotay's comet removal simulation erases 8,000 civilizations, Annorax tells him that 4 billion years before, material from the comet was the catalyst for the eventual development of several civilizations. However, comets, by their very nature, are short-lived, around 10,000 years. There is no way a comet that seeded life across multiple solar systems 4 billion years earlier would still exist.
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Correction: Not entirely correct. The typical dynamical lifetime of a comet is about 500,000 years, which of course, can vary. After its dynamical lifetime, the comet becomes a dead comet, Once a comet has lost all of its available volatile materials, its coma and tail will disappear and the remaining inert nucleus will take on the appearance of an asteroid. Since it is never mentioned what type of comet they are discussing, the scenario is plausible.
wizard_of_gore ★