Life Before Earth

  title={Life Before Earth},
  author={Alexei A. Sharov and Richard Gordon},
  journal={arXiv: General Physics},
Chemical Elements Abundance in the Universe and the Origin of Life
Element synthesis which started with p-p chain has resulted in several specific characteristics including lack of any stable isotope having atomic masses 5 or 8. The carbon to oxygen ratio is fixed
On the Origin of Extraterrestrial Industrial Civilizations
The emergence of intelligence is likely a relatively recent phenomena throughout the cosmos. The total number of habitable extraterrestrial planets within the Milky Way capable of supporting
General Evolution of the Universe Driven By Attraction and Four Levels of Biological Evolution As Its Essential Part
It appeared that this model describes general megaevolution of the Universe well enough to estimate time of macromolecules appearance, that is still unknown, and to predict when the next hierarchogenetic step will take a place.
Evolutionary biosemiotics and multilevel construction networks 4 5
The origin of life is described here as the emergence of simple self-constructing semiotic networks that progressively increased the diversity of their components and relations.
Exploring the Singularity Concept Within Big History
The trend of life’s accelerating increase in complexity throughout its history on Earth suggests that a unique time (a unique or singular event, i.e., the singularity) might be realized soon. At this
Evolutionary Biosemiotics and Multilevel Construction Networks
The origin of life is described here as the emergence of simple self-constructing semiotic networks that progressively increased the diversity of their components and relations.
From Identity to Uniqueness: The Emergence of Increasingly Higher Levels of Hierarchy in the Process of the Matter Evolution †
The main event in the evolution of the Universe was the emergence of new levels of hierarchy, which together constitute the process of hierarchogenesis, and its dynamics is presented graphically by a very regular and smooth curve.


Genome increase as a clock for the origin and evolution of life
The increase of functional non-redundant genome size in macro-evolution was consistent with the exponential hypothesis, and the possibility of panspermia as a source of life on earth should be discussed on equal basis with alternative hypotheses of de-novo life origin.
Economy, speed and size matter: evolutionary forces driving nuclear genome miniaturization and expansion.
Ciliate nuclear dimorphism provides a key test that refutes the selfish DNA and strongly supports the skeletal DNA/karyoplasmic ratio interpretation of genome size evolution.
Could there have been a single origin of life in a big bang universe?
Frank Tipler, in The Physics of Immortality, wrote about how to spread a form of traveling artificial life throughout the known, expanding universe, prior to collapse. The key is to make the ALife
Are We from Outer Space?
The biological record suggests that life on Earth arose as soon as conditions were favorable, which indicates that life either originated quickly, or arrived from elsewhere to seed Earth.
Lack of evolvability in self-sustaining autocatalytic networks constraints metabolism-first scenarios for the origin of life
It is demonstrated here that replication of compositional information is so inaccurate that fitter compositional genomes cannot be maintained by selection and the system lacks evolvability, cautions against metabolism-first theories of the origin of life, although ancient metabolic systems could have provided a stable habitat within which polymer replicators later evolved.
Evolution of Biological Complexity
It is shown that, because natural selection forces genomes to behave as a natural "Maxwell Demon," within a fixed environment, genomic complexity is forced to increase.
Does life's rapid appearance imply a Martian origin?
This work attempts to quantify the relative probabilities for a non-indigenous versus indigenous origin, on the assumption that biogenesis involves one or more highly improbable steps, using a generalization of Carter's well-known observer-selection argument.
Before enzymes and templates: theory of surface metabolism.
It is proposed here that, at an early stage of evolution, there are precursor organisms drastically different from anything the authors know, and life at this early stage is autotrophic and consists of an autocatalytic metabolism confined to an essentially twodimensional monomolecular organic layer.
Genome evolution and the evolution of exon-shuffling--a review.
How much can evolved characters tell us about the tree that generated them?
This paper reviews some recent results that shed light on a fundamental question in molecular systematics: how much phylogenetic `signal' can the authors expect from characters that have evolved under some Markov process, and explores the relationship between the number of sites required for accurate tree reconstruction and other model parameters.