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A limbus mundi elucidation of habitability: the Goldilocks Edge

Published online by Cambridge University Press:  22 May 2020

Ian von Hegner Open the ORCID record for Ian von Hegner [Opens in a new window]
Ian von Hegner*
Affiliation:
Aarhus University, Ny Munkegade 116, DK-8000 Aarhus C, Denmark
*
Author for correspondence: Ian von Hegner, E-mail: [email protected]
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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 is based on both astronomy – the distance and stellar energy – and chemistry – liquid water and the right temperature. However, these factors are only part of the consideration. Thus, discussions of habitability and the possibility for the emergence of life on a world must consider the evolutionary principles that govern life as well as the laws that govern stellar and planetary science. This is important because the following is also known: (iii) The temporal window for the emergence of life is within 600 million years. (iv) The Earth was an extreme environment overall in the period when this window existed. (v) The first life was necessarily fragile. Therefore, chemical evolution must have taken place in a relatively protected and restricted environment. Thus, rather than as in the Goldilocks zone, which focuses too narrowly on the world as a whole, this paper suggests that it is better to focus on a particular region and time period on a world, in which conditions fit for habitability exist. Thus, the following is suggested: ‘The Goldilocks Edge is a spatial and temporal window on an astronomical body or planemo, where liquid solvents, SPONCH elements and energy sources exist’. Furthermore, since the mere presence of these does not necessarily lead to the emergence of life, this possibility only arises when these interact. Thus, it will also be suggested that the following can exist within the Goldilocks Edge: ‘The great prebiotic spot is an environmentally relaxed and semi-shielded area on an otherwise extreme world, wherein conditions advantageous for chemical evolution exist’. Such Goldilocks Edges and the great prebiotic spots within them can collectively represent the full distribution of possibilities for life in a solar system. Thus, the concept of a ‘limbus mundi’ or ‘world's edge’ is introduced.

Keywords

Astrobiologychemical evolutionthe great prebiotic spotthe habitable zone
Type
Research Article
Information
International Journal of Astrobiology , Volume 19 , Issue 4 , August 2020 , pp. 320 - 329
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Copyright
Copyright © The Author(s) 2020. Published by Cambridge University Press

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References

Abbot, DS and Switzer, ER (2011) The Steppenwolf: a proposal for a habitable planet in interstellar space. The Astrophysical Journal 735, L27.CrossRefGoogle Scholar
Adam, Z (2007) Actinides and life's origins. Astrobiology 7, 852–872.CrossRefGoogle ScholarPubMed
Baross, J and Hoffman, SE (1985) Submarine hydrothermal vents and associated gradient environments as sites for the origin and evolution of life. Origins of Life and Evolution Biospheres 15, 327–345.CrossRefGoogle Scholar
Barr, AC and Showman, AP (2009) Heat transfer in Europa's icy shell. In Pappalardo, RT, McKinnon, WB and Khurana, KK (eds), Europa. Tucson: University of Arizona Press, pp. 405–430.Google Scholar
Basri, G (2003) What is a planet? Mercury Magazine 32, 27–34.Google Scholar
Bell, EA, Boehnike, P, Harrison, TM and Mao, WL (2015) Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon. Proceedings of the National Academy of Sciences of the USA 112, 14518–14521.CrossRefGoogle Scholar
Brandenburg, JE (1987) The Paleo-Ocean of Mars. MECA Symposium on Mars: Evolution of its Climate and Atmosphere. Lunar and Planetary Institute, pp. 20–22.Google Scholar
Canup, RM and Asphaug, E (2001) Origin of the moon in a giant impact near the end of the Earth's formation. Nature 412, 708–712.CrossRefGoogle Scholar
Carter, J, Poulet, F, Bibring, JP and Murchie, S (2010) Detection of hydrated silicates in crustal outcrops in the northern plains of Mars. Science 328, 1682–1686.CrossRefGoogle ScholarPubMed
Cavosie, AJ, Valley, JW and Wilde, SA (2005) Magmatic d18O in 4400–3900 Ma detrital zircons: a record of the alteration and recycling of crust in the Early Archean. Earth and Planetary Science Letters 235, 663–681.CrossRefGoogle Scholar
Chyba, CF and Phillips, CB (2002) Europa as an abode of life. Origins of Life and Evolution of Biospheres 32, 47–68.CrossRefGoogle ScholarPubMed
Coenraads, RR and Koivula, JI (2007) Geologica: Earth's Dynamic Forces. Elanora Heights, NSW: Millennium House.Google Scholar
Colín-García, M, Heredia A, Cordero, G, Camprubí, A, Negrón-Butdoza, A, Ortega-Gutiérrez, F, Beraldi, H and Ramos-Bernal, S (2016) Hydrothermal vents and prebiotic chemistry: a review. Boletín de la Sociedad Geológica Mexicana.CrossRefGoogle Scholar
Committee on the Limits of Organic Life in Planetary Systems (2007) The Limits of Organic Life in Planetary Systems. Washington, DC: National Academies Press.Google Scholar
Darwin, F (ed) (1887) The Life and Letters of Charles Darwin, Including an Autobiographical Chapter, 3 Vols. London: John Murray.CrossRefGoogle Scholar
Fastook, JL and Head, JW (2015) Glaciation in the late Noachian icy highlands: ice accumulation, distribution, flow rates, basal melting and top-down melting rates and patterns. Planet Space Science 106, 82–98.CrossRefGoogle Scholar
Gaucher, EAJT, Kratzer, JT and Randall, RN (2010) Deep phylogeny—how a tree can help characterize early life on earth. Cold Spring Harbor Perspectives in Biology 2.CrossRefGoogle ScholarPubMed
Gould, SJ (1996) Full House – The Spread of Excellence From Plato to Darwin. New York: Harmony Books.CrossRefGoogle Scholar
Haldane, JBS (1929) The origin of life. The Rationalist Annual 148, 3–10.Google Scholar
Hart, MH (1978) The evolution of the atmosphere of the earth. Icarus 33, 23–39.CrossRefGoogle Scholar
Hoffman, PF, Kaufman, AJ, Halverson, GP and Schrag, DP (1998) A neoproterozoic snowball earth. Science 281.CrossRefGoogle ScholarPubMed
Hoyle, F and Wickramasinghe, NC (1986) The case for life as a cosmic phenomenon. Nature 322, 509–511.CrossRefGoogle Scholar
Huang, S-S (1959) The problem of life in the universe and the mode of star formation. Publications of the Astronomical Society of the Pacific 71, 421–424.CrossRefGoogle Scholar
Kasting, JF, Whitmire, DP and Reynolds, RT (1993) Habitable zones around main sequence stars. Icarus 101, 108–128.CrossRefGoogle ScholarPubMed
Kivelson, MG, Khurana, KK, Russell, CT, Volwerk, M, Walker, RJ and Zimmer, C (2000) Galileo magnetometer measurements: a stronger case for a subsurface ocean at Europa. Science 289, 1340–1343.CrossRefGoogle ScholarPubMed
Kopparapu, RK, Ramirez, R, Kasting, JF, Eymet, V, Robinson, TD, Mahadevan, S, Terrien, RC, Domagal-Goldman, S, Meadows, V and Deshpande, R (2013) Habitable zones around main-sequence stars: new estimates. Astrophys J 765.CrossRefGoogle Scholar
Levin, PA and Angert, ER (2015) Small but mighty: cell size and Bacteria. Cold Spring Harbor Perspectives in Biology 7, a019216.CrossRefGoogle ScholarPubMed
Lin, L-H, Wang, P-L, Rumble, D, Lippmann-Pipke, J, Boice, E, Pratt, LM, Sherwood Lollar, B, Brodie, EL, Hazen, TC, Andersen, GL, DeSantis, TZ, Moser, DP, Kershaw, D and Onstott, TC (2006) Long-term sustainability of a high-energy, low-diversity crustal biome. Science 314, 479–482.CrossRefGoogle ScholarPubMed
Lowe, DR and Byerly, GR (2018) The terrestrial record of late heavy bombardment. New Astronomy Reviews 81, 39–61.CrossRefGoogle Scholar
McEwen, AS, Ojha, L, Dundas, CM, Mattson, SS, Byrne, S, Wray, JJ, Cull, SC, Murchie, SL, Thomas, N and Gulick, VC (2011) Seasonal flows on warm Martian slopes. Science 333, 740–743.CrossRefGoogle ScholarPubMed
Melosh, HJ (1988) The rocky road to panspermia. Nature 332.CrossRefGoogle ScholarPubMed
Mottl, M, Glazer, B, Kaiser, R and Meech, K (2007) Water and astrobiology. Chemie der Erde: Geochemistry 67, 253–282.CrossRefGoogle Scholar
Mulkidjanian, AY, Bychkov, AY, Dibrova, DV, Galperin, MY and Koonin, EV (2012) Origin of first cells at terrestrial, anoxic geothermal fields. Proceedings of the National Academy of Sciences of the USA 109, E821–E830.CrossRefGoogle ScholarPubMed
Muller, A and Schulze-Makuch, D (2006) Thermal energy and the origin of life. Origins of Life and Evolution of Biospheres 36, 177–189.CrossRefGoogle ScholarPubMed
Nelson, KE, Robertson, MP, Levy, M and Miller, SL (2001) Concentration by evaporation and the prebiotic synthesis of cytosine. Origins of Life and Evolution of Biospheres 31, 221–229.CrossRefGoogle ScholarPubMed
Pohorille, A and Pratt, LR (2012) Is water the universal solvent for life? Origins of Life and Evolution of Biospheres 42, 405–409.CrossRefGoogle ScholarPubMed
Prigogine, I and Lefever, R (1968) Symmetry breaking instabilities in dissipative systems. The Journal of Chemical Physics 48, 1695–1700.CrossRefGoogle Scholar
Scharf, C, Virgo, N, Cleaves, II, James, H, Aono, M, Aubert-Kato, N, Aydinoglu, A, Barahona, A, Barge, LM, Benner, SA, Biehl, M, Brasser, R, Butch, CJ, Chandru, K, Cronin, L, Danielache, S, Fischer, J, Hernlund, J, Hut, P, Ikegami, T, Kimura, J, Kobayashi, K, Mariscal, C, McGlynn, S, Butard, B, Packard, N, Pascal, R, Pereto, J, Rajamani, S, Sinapayen, L, Smith, E, Switzer, C, Takai, K, Tian, F, Ueno, Y, Yoytek, M, Witkowski, O and Yabuta, H (2015) A strategy for origins of life research. Astrobiology 15, 1031–1042.CrossRefGoogle ScholarPubMed
Schopf, JW, Kudryavtsev, AB, Czaja, AD and Tripathi, AB (2007) Evidence of Archean life: stromatolites and microfossils. Precambrian Research 158, 141–155.CrossRefGoogle Scholar
Stevens, TO and McKinley, JP (1995) Lithoautotrophic microbial ecosystems in deep basalt aquifers. Science 270, 450–454.CrossRefGoogle Scholar
Stevenson, DJ (1999) Life-sustaining planets in interstellar space? Nature 400, 32.CrossRefGoogle ScholarPubMed
Thomas, PC, Tajeddine, R, Tiscareno, MS, Burns, JA, Joseph, J, Loredo, TJ, Helfenstein, P and Porco, C (2016) Enceladus's measured physical liberation requires a global subsurface ocean. Icarus 264, 37–47.CrossRefGoogle Scholar
Toussaint, O, Houbion, A and Remacle, J (1992) Aging as a multi-step process characterized by a lowering of entropy production leading the cell to a sequence of defined stages. II. Testing some predictions on aging human fibroblasts in culture. Mechanisms of Ageing and Development.CrossRefGoogle ScholarPubMed
Tyler, RH (2008) Strong ocean tidal flow and heating on moons of the outer planets. Nature 456, 770–772.CrossRefGoogle ScholarPubMed
von Hegner, I (2020) Extremophiles: a special or general case in the search for extra-terrestrial life. Extremophiles 24, 167–175, Published online: 9 November 2019.CrossRefGoogle ScholarPubMed
Waite, JH Jr, Lewis, WS, Magee, BA, Lunine, JI, McKinnon, WB, Glein, CR, Mousis, O, Young, DT, Brockwell, T, Westlake, J, Nguyen, M-J, Teolis, BD, Niemann, HB, McNutt, RL Jr, Perry, M and Ip, W-H (2009) Liquid water on Enceladus from observations of ammonia and Ar-40 in the plume. Nature 460, 487–490.CrossRefGoogle Scholar
Ward, PD and Benner, S (2007) Alien biochemistries. In Baross J and Sullivan WT (eds), Planets and Life: The Emerging Science of Astrobiology. Cambridge, UK: Cambridge University Press, pp. 537–544.CrossRefGoogle Scholar
Weisstein, EW Spherical Cap. From MathWorld – A Wolfram Web Resource. Available at http://mathworld.wolfram.com/SphericalCap.htmlGoogle Scholar
Weisstein, EW Spherical Segment. From MathWorld – A Wolfram Web Resource. Available at http://mathworld.wolfram.com/SphericalSegment.htmlGoogle Scholar
Wolf, ET and Toon, OB (2014) Delayed onset of runaway and moist greenhouse climates for Earth. Geophys Res Lett 41, 167–172.CrossRefGoogle Scholar