Goldilocks Conditions

Goldilocks conditions

The Earth is ideally located in a Goldilocks condition—being neither too close nor too distant from the Sun.

A theme in Big History is what has been termed Goldilocks conditions or the Goldilocks principle, which describes how "circumstances must be right for any type of complexity to form or continue to exist," as emphasized by Spier in his recent book.For humans, bodily temperatures can neither be too hot nor too cold; for life to form on a planet, it can neither have too much nor too little energy from sunlight. Stars require sufficient quantities of hydrogen, sufficiently packed together under tremendous gravity, to cause nuclear fusion.

Christian suggests that the universe creates complexity when these Goldilocks conditions are met, that is, when things are not too hot or cold, not too fast or slow. For example, life began not in solids (molecules are stuck together, preventing the right kinds of associations) or gases (molecules move too fast to enable favorable associations) but in liquids such as water which permitted the right kinds of interactions at the right speeds.

Somewhat in contrast, Chaisson has maintained for well more than a decade that "organizational complexity is mostly governed by the optimum use of energy—not too little as to starve a system, yet not too much as to destroy it" (italics in the original published paper). Neither maximum energy principles nor minimum entropy states are likely relevant, and appeals to "Goldilocks principles" (or other such fairy tales) are unnecessary to appreciate the emergence of complexity in Nature writ large.