Early Origin of Life on Earth
|Features of life and evolution indicate that life could only originate during
meteorite bombardment of early Earth and not later or from other planets.
I try to show that life already evolved during the time of
disastrous meteorite impacts which nearly sterilized the whole Earth by boiling and evaporating most of the liquid water.
This is in contrast to the usual unquestioned assumption that early life evolved after the meteorite bombardment of early
Earth calmed down and stable oceans were present.
The main reasons for this thesis are:
- The unexpected uniformity of the genetic code, which indicates a near extinction event, extra-terrestrial origin
or massive horizontal gene transfer.
- The two fundamentally different forms of cell membranes, which indicate that life started on Earth and not on another
- The much bigger evolution speed needed to explain all the fundamental "inventions" which lead to the first living cells.
Evolution always made great steps in short time when there was a large environment open to conquer without competition
by other life forms already present. The temporary and nearly Earth-wide repetitive absence of competition
(caused by the bombardment) is the most perfect environment you can think of to make giant steps in evolution.
Local heat-caused concentration produces both polymers and high energy molecules to sustain primitive life forms with
all kinds of building blocks after dilution.
A critical discussion with new arguments against common alternative explanations (auto-trophic origin, extraterrestrial
origin, horizontal gene transfer) is also provided.
Following this thesis means that life could only originate early or not
at all. Since the only reason for assuming that life originates on every suitable planet is the early origin of life on
Earth, this also means that extraterrestrial life most likely is very rare and life on Earth might very well be
unique in our galaxy.
all of this is explained and discussed in scientific detail:
In the document above it is also shown that the
of cysteine synthesis is clearly a late energy
optimization of the methanogens and not a feature of the last universal common ancestor as currently claimed.
(see page 6
Chapter VI (see page 16
contains an (hopefully) easy to read explanation (without mathematics) how paralogs bias phylogenetic trees
(and systematically lead to these wrong claims, which have not been questioned so far). I hope the biologist community
will take this into account more often in future and that a more critical approach to "sure" mathematical results
(based on false unmentioned assumptions) becomes more common (see also page 21
for another case).