Earth’s distance to the sun is finely tuned for life. Additionally, its orbit is also finely tuned. If the orbit were more elliptical, the temperature variations on earth would be extreme. 1
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Rhodes, F. H. (2012). Earth: A Tenant's Manual. Ithaca: Cornell University Press.
- Rhodes, 2012, p. 21: “Earth enjoys not only a “just right” active rocky crust, but also a “just right” almost circular orbit around the Sun and a “just right” rotation period. A highly eccentric elliptical orbit, for example, would lead to extreme temperature variations. A slow rotation speed would give prolonged hours of darkness, and both features would be less hospitable to life.” ↩