A limbus mundi elucidation of habitability: the Goldilocks Edge

  title={A limbus mundi elucidation of habitability: the Goldilocks Edge},
  author={Ian von Hegner},
  journal={International Journal of Astrobiology},
  pages={320 - 329}
  • Ian von Hegner
  • Published 2020
  • Geology, Physics
  • International Journal of Astrobiology
Abstract The habitable zone is the circumstellar region in which a terrestrial-mass planet with an atmosphere can sustain liquid water on its surface. However, despite the usefulness of this concept, it is being found to be increasingly limited in a number of ways. The following is known: (i) Liquid water can exist 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… Expand
A trampoline effect occurring in the stages of planetary reseeding
It is possible that life has been, and still is, transported between the worlds of the solar system, owing to impacts leading material away from the impact region, in the so-called lithopanspermia theory. Expand
Extreme exoworlds and the extremophile paradox
The use of extremophiles as analogues to extraterrestrial life has limitations due to the very conditions evolution operates under, although analysis of these conditions provides conceptual tools for the search for life elsewhere in the solar system and beyond. Expand
arXiv.org | Cornell University Library, September 2021.
Extremophiles have gained prominence by providing an experimental approach to astrobiology. Extremophiles gain equal value by being part of a framework for high-level characterisation of theExpand


Geologica: Earth’s Dynamic Forces
  • Elanora Heights, NSW: Millennium House
  • 2007
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Small but Mighty: Cell Size and Bacteria.
The impact of size on bacterial evolution, physiology, and morphogenesis is reviewed. Expand
Delayed onset of runaway and moist greenhouse climates for Earth
As the Sun slowly grows brighter over its main sequence lifetime, habitability on Earth's surface will eventually become threatened probably leading to moist and then runaway greenhouse climates.Expand
Habitable Zones Around Main-Sequence Stars: New Estimates
Identifying terrestrial planets in the habitable zones (HZs) of other stars is one of the primary goals of ongoing radial velocity (RV) and transit exoplanet surveys and proposed future spaceExpand
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Abstract Fossil evidence of the existence of life during the Archean Eon of Earth history (>2500 Ma) is summarized. Data are outlined for 48 Archean deposits reported to contain biogenicExpand
Extremophiles: a special or general case in the search for extra-terrestrial life?
Depending on whether it is difficult or easy for worlds to maintain the habitability, the search for extra-terrestrial life with a focus on extremophiles will either represent a search for dying worlds, or aSearch for special life on living worlds, focusing too narrowly on extreme values. Expand
The Origin of Life
WHEN DARWIN PRESENTED a rational approach to explain the origin and evolution of the diverse species of animals, a question naturally arose: Where is the beginning of this process? If life begetsExpand
Enceladus's measured physical libration requires a global subsurface ocean
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