<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/167892c6-224d-4a55-9451-a2278de25158/59695745-203C-454E-9682-7B6238C069A2/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://en.wikipedia.org/w/index.php?title=Fermi_paradox&oldid=312521986" href="http://en.wikipedia.org/w/index.php?title=Fermi_paradox&oldid=312521986" style="font-size: 11px;">en.wikipedia.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Fermi_paradox&oldid=312521986"><SPAN>Fermi paradox</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Fermi_paradox&oldid=312521986"><P>The <B>Fermi paradox</B> is the apparent contradiction between high estimates of the probability of the existence of <A title="Extraterrestrial life" href="http://en.wikipedia.org/wiki/Extraterrestrial_life" linkindex="10">extraterrestrial civilizations</A> and the lack of evidence for, or contact with, such civilizations.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Fermi_paradox&oldid=312521986"><P>The extreme <A title="Age of the universe" href="http://en.wikipedia.org/wiki/Age_of_the_universe" linkindex="11">age of the universe</A> and its vast number of stars suggest that if the Earth is typical, extraterrestrial life should be common.<SUP class="reference" id="cite_ref-sagan_0-0"><A href="#cite_note-sagan-0" linkindex="12"><SPAN>[</SPAN>1<SPAN>]</SPAN></A></SUP> In an informal discussion in 1950, the <A title="Physicist" href="http://en.wikipedia.org/wiki/Physicist" linkindex="13">physicist</A> <A title="Enrico Fermi" href="http://en.wikipedia.org/wiki/Enrico_Fermi" linkindex="14">Enrico Fermi</A> questioned why, if a multitude of advanced extraterrestrial civilizations exist in the <A title="Milky Way" href="http://en.wikipedia.org/wiki/Milky_Way" linkindex="15">Milky Way</A> <A title="Galaxy" href="http://en.wikipedia.org/wiki/Galaxy" linkindex="16">galaxy</A>, evidence such as <A class="mw-redirect" title="Alien spacecraft" href="http://en.wikipedia.org/wiki/Alien_spacecraft" linkindex="17">spacecraft</A> or <A class="mw-redirect" title="Von Neumann probe" href="http://en.wikipedia.org/wiki/Von_Neumann_probe" linkindex="18">probes</A> are not seen. A more detailed examination of the implications of the topic began with a paper by <A title="Michael H. Hart" href="http://en.wikipedia.org/wiki/Michael_H._Hart" linkindex="19">Michael H. Hart</A> in 1975, and it is sometimes referred to as the <B>Fermi-Hart paradox</B>.<SUP class="reference" id="cite_ref-1"><A href="#cite_note-1" linkindex="20"><SPAN>[</SPAN>2<SPAN>]</SPAN></A></SUP> Another closely related question is the <B>Great Silence</B><SUP class="reference" id="cite_ref-Brin_2-0"><A href="#cite_note-Brin-2" linkindex="21"><SPAN>[</SPAN>3<SPAN>]</SPAN></A></SUP>—even if travel is hard, if life is common, why don't we detect their <A title="Radio" href="http://en.wikipedia.org/wiki/Radio" linkindex="22">radio transmissions</A>?</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://en.wikipedia.org/w/index.php?title=Fermi_paradox&oldid=312521986"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/en.wikipedia.org/img/1A23EF84-7EA6-4BCF-9B94-0CBE08D9A2B5" alt="" /></div></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/59695745-203C-454E-9682-7B6238C069A2/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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