The Evolutionary Biology Lecture of the Week for June 5, 2006 is now available
at:
http://aics-research.com/lotw/The talks center primarily around evolutionary biology, in all of its aspects:
cosmology, astronomy, planetology, geology, astrobiology, ecology, ethology,
biogeography, phylogenetics and evolutionary biology itself, and are presented
at a professional level, that of one scientist talking to another. All of the
talks were recorded live at conferences.
This is the third lecture in a summer-long series on the new science of
astrobiology.
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June 5, 2006
Part III: Astrobiology
Taking the Galactic Planetary Survey
Gregory Laughlin, University of California, Santa Cruz
35 min.
"There are two distinct possibilities: either we are alone in the Universe,
or we are not. Both are equally terrifying."
— Arthur C. Clarke
The knock against astrobiology has remained the same for forty years now:
astrobiology is an area of study without a known subject. George Gaylord
Simpson famously wrote in an issue of Science (v.143, p.769) in 1964: "this
'science' has yet to demonstrate that its subject matter exists!"
Yet even should the discovery of a second, independent genesis of life
elsewhere in the universe remains decades away, astrobiology will nonetheless
profoundly change of our views of the evolution of life on Earth, in the
absence of that singular discovery. Geology was the science that informed and
transformed evolutionary thought during Darwin's time. Comparative planetology,
although it is a new field of inquiry, will do the same during ours.
Speculating on the evolution of life in the universe has always been a risky
business, and one not always highly regarded. Two hundred and fifty years ago,
when the first thoughts that the formation of the planets must have occurred by
secular (natural) means in the two competing cosmogenies of Buffon and Laplace,
rather than as part of a supernatural command, the ideas were met with at best
only tepid enthusiasm.
Life, up until recently, has always been a property unique to the planet Earth.
It really hasn't been considered in any other context. But we are now beginning
an extraordinary new voyage of discovery: we are beginning to take a galactic
survery of planets, at least in our very small region of the Milky Way. Because
of this, we are beginning to get a sense of the diversity of planetary systems
possible.