VIII. Pedia Sapiens: A New Genesis Future
C. An Earthropic Principle: Novel Evidence for a Special Planet
Waltham, David. Half a Billion Years of Good Weather: Gaia or Good Luck? Astronomy & Geophysics. 48/3, 2007. Earth’s climate over the past 550 million years of the Phanerozoic era of “visible animal life” has been an order of magnitude more stable than previous eons. A University of London geologist finds such consistency in accord with a biosphere that maintains atmospheric conditions favorable to its flora and fauna. A large Moon and a gap between Jupiter and Saturn further contribute to a preferential “anthropic” milieu. In an expanded cosmic perspective then, the human imperative not to upset this conducive global environment becomes even more critical.
Perhaps most importantly of all, this discovery would imply that climate stability is far from inevitable and that human-induced (or other) climate change could be far more dramatic and damaging than we have previously believed. (26)
Waltham, David. Lucky Planet: Why Earth is Exceptional – and What That Means for Life in the Universe. New York: Basic Books, 2014. The University of London astrobiologist and geologist contends that our relatively stable biosphere climate over a billion years is why we are here to witness. But such a stretch of benign weather is so improbable as to make it statistically unique. By one man’s analysis and opinion, no other neighbors are out there, this Earth is it. But could we just as well proffer that Earth is a “Plucky Planet” whereupon innate Gaian feedback processes have served to regulate, and life’s cooperative intelligence has keep evolution on an ascendant course?
As we discover countless exoplanets orbiting other stars, we become ever more hopeful that we may come across extraterrestrial life. Yet even as we become aware of the vast numbers of planets outside our solar system, it has also become clear that Earth is exceptional. In Lucky Planet, astrobiologist David Waltham argues that Earth’s climate stability is one of the primary factors that makes it able to support life, and that nothing short of luck made such conditions possible. Describing the three factors that typically control a planet’s average temperature—the heat received from its star, how much heat the planet absorbs, and the concentration of greenhouse gases in the atmosphere — Waltham paints a complex picture of how special Earth’s climate really is. Citing factors such as the size of our Moon and the effect of an ever-warming Sun, Waltham challenges the prevailing scientific consensus that other Earth-like planets have natural stabilizing mechanisms that allow life to flourish. (Publisher excerpts)
Waltham, David. Star Masses and Star-Planet Distances for Earth-like Habitability. Astrobiology. 17/1, 2017. The Royal Holloway University of London exoplanet researcher and author of Lucky Planet: Why Earth is Exceptional (2014) discusses current studies about how conducive stellar types and solar systems may or may not be conducive for life to originate, inhabit and evolve.
Wang, Haiyang, et al. The Volatility Trend of Protosolar and Terrestrial Elemental Abundances. arXiv:1810.12741. Australian National University, Canberra astrophysicists including Charles Lineweaver provide a detailed quantification of stellar and planetary chemical affinities via dynamic out-gassings over the ages of solar system evolution. See also Enhanced Constraints on the Interior Composition and Structure of Terrestrial Exoplanets by this group at arXiv:1810.04615 In regard, still another variable is involved with the relative habitability of a candidate exoEarth.
We present new estimates of protosolar elemental abundances based on an improved combination of solar photospheric abundances and CI chondritic abundances. These new estimates indicate CI chondrites and solar abundances are consistent for 60 elements. We compare our new protosolar abundances with our recent estimates of bulk Earth composition, thereby quantifying the devolatilization in going from the solar nebula to the formation of the Earth. (Abstract)
Watson, Andrew. Gaia and Observer Self-selection. Schneider, Stephen, et al, eds. Scientists Debate Gaia. Cambridge: MIT Press, 2004. Some thoughts on a “biological anthropic principle” whereof only conducive planets that evolve complex sentient beings can achieve their own intelligent discovery and self-recognition.
If the Universe is Teeming with Aliens-- Where is Everybody?
New York: Springer,
The entry is a second, award-winning edition of the British physicist’s 2002 volume with the same Fermi paradox title. Since huge advances have been made since, especially about myriad exoplanets, 25 more possible answers have been added to the original 50 as to why amongst billions of galaxies, each with billions of solar systems, there are as yet no overt signs of extraterrestrial civilizations. The work is also seen as an update to Rare Earth (2003) by Peter Ward and Donald Brownlee whence celestial, geologic, and evolutionary stages that need to happen or be passed through (Lineweaver) pile up even more, such as just the right degree of asteroid impacts.
Weinberger, Alycia. Building Planets in Disks of Chaos. Sky & Telescope. November 13, 2008. Reviewed in the Exoearths section, this article by a Carnegie Institution of Washington, DC astronomer is also noted here, along with “Planetary Peculiarities” by Ken Croswell in the September S. & T., “Are Super-Sized Earths the New Frontier” by Ray Jayawardhana in the November 2008 Astronomy, and other such postings, because the latest celestial research conveys how stochastic and variable are the occasions, orbits and kinds of myriad terrestrial worlds. We human beings have the rarest of opportunities to therefore choose Earth as a fruitful abode of future, peaceful, sustainable, life and mind, a child of the expectant cosmos.