Where orbits are wildly varying, life has no chance to develop. Changes are too extreme. Temperatures melt tin, then solidify nitrogen. If it is once established, life is persistent; it can adapt to many extremes. But there is a fragility in the original creation that calls for a long period of tightly-controlled variations.

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Quote text and notes from Wikiquote: Charles Sheffield (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.