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<DIV dir=ltr align=left><SPAN class=480522618-21102006>AB: 210 extrasolar
planets have been found, according to the <SPAN class=480522618-21102006>The
Extrasolar Planets Encyclopaedia,</SPAN> <A
href="http://exoplanet.eu/catalog.php"><FONT
color=#000000>http://exoplanet.eu/catalog.php</FONT></A>; or 197, according
to JPL, <A href="http://planetquest1.jpl.nasa.gov/atlas/atlas_index.cfm"><FONT
color=#000000>http://planetquest1.jpl.nasa.gov/atlas/atlas_index.cfm</FONT></A>,
which links to a database that may be useful, and could overlayed on <A
href="http://www.anzwers.org/free/universe/w50lys.gif"><FONT
color=#000000>www.anzwers.org/free/universe/w50lys.gif</FONT></A> and other
maps at <A href="http://www.anzwers.org/free/universe"><FONT
color=#000000>http://www.anzwers.org/free/universe</FONT></A>. PlanetQuest
is developing a "star catalog" that may also be useful when available, <A
href="http://www.planetquest.org"><FONT
color=#000000>http://www.planetquest.org</FONT></A>. Also see "Detecting
New Planets" <A
href="http://www.seti.org/site/pp.asp?c=ktJ2J9MMIsE&b=179076"><FONT
color=#000000>http://www.seti.org/site/pp.asp?c=ktJ2J9MMIsE&b=179076</FONT></A>.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=480522618-21102006><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=480522618-21102006>In "SPECTRAL EVOLUTION OF
AN EARTH-LIKE PLANET," <SPAN class=480522618-21102006><A
href="http://arxiv.org/ftp/astro-ph/papers/0609/0609398.pdf"><FONT
color=#000000>http://arxiv.org/ftp/astro-ph/papers/0609/0609398.pdf</FONT></A>, </SPAN>Harvard
and JPL astronomers report that they have established a model for the Earth's
atmosphere and detectable biomarkers over the lifetime of the Earth.
"Observations of these features on an exoplanet should be able to place an
Earth-like planet with regard to its evolution. Knowledge of those features will
help to optimize the design of proposed instruments to search for Earth-like
planets. If an exoplanet is found with a corresponding spectrum, we will have
good evidence for characterizing its evolutionary state, its habitability, and
the degree to which it shows signs of life." </SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=480522618-21102006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=480522618-21102006>Regarding the Fermi
paradox, <A
href="http://www.seti.org/site/pp.asp?c=ktJ2J9MMIsE&b=179077"><FONT
color=#000000>http://www.seti.org/site/pp.asp?c=ktJ2J9MMIsE&b=179077</FONT></A> and
<A href="http://www.space.com/searchforlife/seti_thursday_060720.html"><FONT
color=#000000>http://www.space.com/searchforlife/seti_thursday_060720.html</FONT></A> have
interesting discussions. I don't understand why it's a paradox if we've only
explored a miniscule portion of the search space (number of stars, percentage of
time they are observed, EIRP range, frequency range, signal modulation
schemes, etc.), based on an unpublished study of search space I did a few
years ago. Comments?</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=480522618-21102006><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=480522618-21102006><FONT face=Arial
size=2>Robert: regarding <FONT face="Times New Roman"><FONT size=3>invisibility
of post-Singularity civilizations (I assume this refers to the transition
from RF to more efficient communication schemes?), this would not, of course,
apply to communications with other solar systems or galaxies, which could be
significant. It might be interesting to look at the
Harvard/JPL data and think about what spectral
characteristics might be specific to post-Singularity civilizations,
including post-ecophage civilizations. </FONT></FONT></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=480522618-21102006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=480522618-21102006><SPAN
class=480522618-21102006>I am currently researching information on active SETI
(<A href="http://www.seti.org/site/pp.asp?c=ktJ2J9MMIsE&b=179532"><FONT
color=#000000>http://www.seti.org/site/pp.asp?c=ktJ2J9MMIsE&b=179532</FONT></A>) and
welcome any correspondence on this subject. </SPAN></SPAN></DIV>
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From: extropy-chat-bounces@lists.extropy.org
[mailto:extropy-chat-bounces@lists.extropy.org] On Behalf Of Robert
Bradbury<BR>Sent: Saturday, October 21, 2006 12:31 PM<BR>To: ExI chat
list<BR>Subject: Re: [extropy-chat] The Drake Equation and Spatial
Proximity<BR><BR></DIV>
<DIV></DIV><BR>
<DIV><SPAN class=gmail_quote>On 10/21/06, A B <<A
href="mailto:austriaaugust@yahoo.com"><FONT
color=#000000>austriaaugust@yahoo.com</FONT></A>> wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV>It would be interesting to display the Drake calculation (or a more
"updated" variation of it) as a 3-D, statistical (even) distribution
overlaying the Milky Way galaxy. It could provide a "probable" range of
physical distances between "intelligent civilizations" - and might help with
some insights into the Fermi Paradox ... ? </DIV></BLOCKQUOTE>
<DIV><BR>This is only interesting if you scale the stars (and civilizations)
at their level of development (incapable of supporting life, capable of
supporting simple life, capable of supporting complex life, capable of
supporting technological civilizations, post-singularity civilizations).
The density of those various star states varies with general galactic position
(and probably "local" galactic quadrant history). <BR><BR>Of course its kind
of hard to display the post-singularity civilizations -- because we _can't_
see them!<BR><BR>Robert<BR><BR></DIV><BR></DIV><BR></BLOCKQUOTE></BODY></HTML>