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Q&A How critical is it for life that a planet remains within the habitable zone at all times?

Important note: The orbits in the diagram are elliptical. They have low eccentricity so they appear to be off centre circles but they really are ellipses with the star at a focus. The habitable...

5 answers  ·  posted 10y ago by smithkm‭  ·  last activity 6y ago by smithkm‭

Question biology planets