Evolutionary exobiology: towards the qualitative assessment of biological potential on exoplanets

  title={Evolutionary exobiology: towards the qualitative assessment of biological potential on exoplanets},
  author={D. Stevenson and S. Large},
  journal={International Journal of Astrobiology},
  pages={204 - 208}
Abstract A planet may be defined as habitable if it has an atmosphere and is warm enough to support the existence of liquid water on its surface. Such a world has the basic set of conditions that allow it to develop life similar to ours, which is carbon-based and has water as its universal solvent. While this definition is suitably vague to allow a fairly broad range of possibilities, it does not address the question as to whether any life that does form will become either complex or… Expand
The Niche, Its Hypervolume and the Entropy of Existence
Although life may be ubiquitous, the ultimate question is whether intelligent (or even complex multicellular) life is equally abundant. Moreover, given a few certainties, such as an energy andExpand
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Planets that orbit M-class dwarf stars in their habitable zones are expected to become tidallylocked in the first billion years of their history. Simulations of potentially habitable planets orbitingExpand
S1473550418000253jra 377..383
‘Where is everybody?’ remarked Enrico Fermi, leading to the famous, and as yet unanswered ‘Fermi’s Paradox’ as this remark has come to be known. While there are a number of possible solutions thatExpand
The bio-habitable zone and atmospheric properties for planets of red dwarfs
  • A. Wandel, J. Gale
  • Physics, Geology
  • International Journal of Astrobiology
  • 2019
Abstract The Kepler data show that habitable small planets orbiting Red Dwarf stars (RDs) are abundant, and hence might be promising targets to look at for biomarkers and life. Planets orbitingExpand
Exoplanets, Granitoids and Evolutionary Potential
As we have seen, granite is ubiquitous on terrestrial bodies in the solar system. Its volume relates to two factors: the persistence of volcanism and the presence of water. The more water there isExpand
Exploring the co-evolution of extraterrestrial atmospheres and alien biospheres
University of Tokyo, Tokyo, Japan Australian National University, Canberra, Australia Cavendish Laboratory, University of Cambridge, United Kingdom Georgia Institute of Technology, Atlanta, USAExpand
Proto-Soziologie außerirdischer Zivilisationen
Ein weiteres Herzstuck des Bandes ist dieses Kapitel zur Proto-Soziologie auserirdischer Zivilisationen. Hier wird gefragt, was auf Basis irdischen Wissens uberhaupt uber auserirdische ZivilisationenExpand
S1473550419000235jra 126..135
  • 2020


Implications of an anthropic model of evolution for emergence of complex life and intelligence.
The model analysis is extended to derive probability distributions for each step, and the success of the model lends support to a "Rare Earth" hypothesis: structurally complex life is separated from prokaryotes by several very unlikely steps and, hence, will be much less common than proKaryotes. Expand
Must Early Life Be Easy? The Rhythm of Major Evolutionary Transitions
If we are not to conclude that most planets like Earth have evolved life as intelligent as we are, we must presume Earth is not random. This selection effect, however, also implies that the origin ofExpand
No climate paradox under the faint early Sun
It is hypothesized that a lower albedo on the Earth, owing to considerably less continental area and to the lack of biologically induced cloud condensation nuclei, made an important contribution to moderating surface temperature in the Archaean eon, thus alleviating the need for extreme greenhouse-gas concentrations to satisfy the faint early Sun paradox. Expand
Life might be rare despite its early emergence on Earth: a Bayesian analysis of the probability of abiogenesis
Life arose on Earth sometime in the first few hundred million years after the young planet had cooled to the point that it could support water-based organisms on its surface. The early emergence ofExpand
Rise to modern levels of ocean oxygenation coincided with the Cambrian radiation of animals
New molybdenum isotope data are presented that demonstrate that the areal extent of oxygenated bottom waters increased in step with the early Cambrian bioradiation of animals and eukaryotic phytoplankton, marking the first establishment of a key environmental factor in modern-like ecosystems. Expand
What sparked the Cambrian explosion?
Biologists have argued for decades over what ignited this evolutionary burst 540 million years ago, but the precise cause has remained elusive, in part because so little is known about the physical and chemical environment at that time. Expand
What's in a name? The Columbia (Paleopangaea/Nuna) supercontinent
article Supercontinents play an important role in Earth's history. The exact definition of what constitutes a super- continent is difficult to establish. Here the argument is made, using Pangaea as aExpand
Niche filling slows the diversification of Himalayan songbirds
It is shown that body size and shape differences evolved early in the radiation, with the elevational band occupied by a species evolving later, which implies that speciation rate is ultimately set by niche filling, rather than by the rate of acquisition of reproductive isolation. Expand
Evolution of multicellularity coincided with increased diversification of cyanobacteria and the Great Oxidation Event
The results suggest that multicellularity could have played a key role in triggering cyanobacterial evolution around the Great Oxidation Event, and an origin of cyanobacteria before the rise of atmospheric oxygen. Expand
The Major Transitions in Evolution Revisited
In this volume, prominent scholars reconsider and extend the earlier book's themes in light of recent developments in evolutionary biology, and discuss different frameworks for understanding macroevolution, prokaryote evolution, and the complex evolution of multicellularity. Expand