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Future > Self-Selection
Secco, Luigi, et al.
Habitability of Local, Galactic and Cosmological Scales.
University of Padova astroscientists consider these near and far domains by way of the latest exoplanet and exosolar findings and again reach an auspicious conclusion. An “Earth peculiarity” appears due to features such as an optimum orbit around the sun, benign solar system, magnetic field strength, good nitrogen to oxygen ratio, ocean to land plate tectonics, an ideally placed large moon, obliquity tilt, and more. Akin to Planetary Astrobiology by Victoria Meadows, et al (2019, 2020 herein), as the second quotes alludes out of a concatenation of some 1020 candidate worlds, our emergent person/sapiensphere progeny could very well be its first, best, or last universal opportunity to observe, read, affirm self-select and begin a new creation.
The aim of this paper is to underline conditions necessary for the emergence and development of life. They are placed at a local planetary scale, a Galactic scale and within cosmic evolution. We will consider the circumstellar habitable zone (CHZ), a Galactic Habitable Zone (GHZ), and also a set of strong cosmological constraints to allow Anthropic life. Some requirements are specific to a single scale and their physical phenomena, while others are due to cumulative effects across scales. A surmise is that all the habitability conditions here so detailed must at least be met. Thus, some sixty years later a human-like presence may appear as "a monstrous sequence of accidents" as (Fred) Hoyle (1959) thought, or as a providential collaboration which can imply how finely tuned is the architecture within which precious Life is embedded. (Abstract edits)
Starting from the local scale, life leads to connect us with the largest scale, that of Universe. From this analysis a possible scenario arises in which links among the different scales are advanced. Even if possibly partial, a large set of minimum conditions has been identified which must be met for allowing life. The consequence of these conditions is that if we look at life from the probability point of view and then regard it as a complex phenomenon composed, by compatible and independent events, the probability to get it tends drastically to zero. But here we are! (24)