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The habitable zone is the circumstellar region in which a terrestrial-massplanet with an atmosphere can sustain liquid water on its surface. However,despite the usefulness of this concept, it is being found to be increasinglylimiting in a number of ways. The following is known: (i) Liquid water canexist on worlds for reasons unrelated to its specific distance from a star.(ii) Energy sources can exist for reasons unrelated to the distance to a star.Furthermore, the habitable zone is based on both astronomy: the distance andstellar energy, and chemistry: liquid water and the right temperature. However,these factors are only part of the consideration. Thus, discussions ofhabitability and the possibility for the emergence of life on a world mustconsider the evolutionary principles that govern life as well as the laws thatgovern stellar and planetary science. This is important because the followingis also known: (iii) The time window for the emergence of life is within 600million years. (iv) The Earth was an extreme environment overall in the periodwhen this window existed. (v) The first life was necessarily fragile.Therefore, chemical evolution must have taken place in a relatively protectedand restricted environment. Thus, rather than as in the Goldilocks zone, whichfocuses too narrowly on the world as a whole, this paper suggests that it isbetter to focus on a particular region and time period on a world, in whichfitting conditions for habitability exist. Thus, the following is suggested:The Goldilocks Edge is a spatial and temporal window on an astronomical body orplanemo, where liquid solvents, SPONCH elements, and energy sources exist.Furthermore, since the mere presence of these do not in themselves necessarilylead to the emergence of life, this possibility only arises when theseinteract. Thus, the prebiotic spot will be suggested.

A limbus mundi elucidation of habitability: the Goldilocks Edge