Gaia as Solaris: An Alternative Default Evolutionary Trajectory
Srdja Jankovi\'c, Ana Kati\'c, and Milan M. \'Cirkovi\'c

TL;DR
This paper explores an alternative evolutionary pathway where planetary biospheres evolve into highly integrated superorganisms, inspired by Lem's Solaris, with implications for detecting biosignatures and understanding life's diversity in the universe.
Contribution
It introduces a novel macroevolutionary scenario of biospheric integration inspired by Solaris, combining astrobiology, philosophy, and theoretical models to expand understanding of planetary evolution.
Findings
Proposes a superorganism biosphere model based on Gaia hypothesis.
Predicts new biosignatures for detecting highly integrated biospheres.
Discusses philosophical implications of extreme functional integration.
Abstract
Now that we know that Earth-like planets are ubiquitous in the universe, as well as that most of them are much older than the Earth, it is justified to ask to what extent evolutionary outcomes on other such planets are similar, or indeed commensurable, to the outcomes we perceive around us. In order to assess the degree of specialty or mediocrity of our trajectory of biospheric evolution, we need to take into account recent advances in theoretical astrobiology, in particular (i) establishing the history of habitable planets' formation in the Galaxy, and (ii) understanding the crucial importance of "Gaian" feedback loops and temporal windows for the interaction of early life with its physical environment. Hereby we consider an alternative macroevolutionary pathway that may result in tight functional integration of all sub-planetary ecosystems, eventually giving rise to a true…
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