<div dir="ltr">I think most of the energy though was channeled in to gravitational waves. They would not be so deadly at long distances from the source. <img src="http://t.sidekickopen35.com/e1t/o/5/f18dQhb0S7ks8dDMPbW2n0x6l2B9gXrN7sKj6v4LR3dW8qSMPY7dKPKPW7fRYjz2zlZNzW5CvrmQ1k1H6H0?si=6537132302139392&pi=1688135d-f9b4-4781-9e62-78f29ad8c207" style="display:none!important" height="1" width="1"></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 11, 2016 at 1:39 PM, Giulio Prisco <span dir="ltr"><<a href="mailto:giulio@gmail.com" target="_blank">giulio@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div></div><div>The energy that kills an entire galaxy would be released as hard gamma rays. "Hot enough to break nuclei at 50,000 light years" (Egan's Diaspora)</div><div><div class="h5"><div><br>On Feb 11, 2016, at 6:50 PM, spike <<a href="mailto:spike66@att.net" target="_blank">spike66@att.net</a>> wrote:<br><br></div><blockquote type="cite"><div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> extropy-chat [<a href="mailto:extropy-chat-bounces@lists.extropy.org" target="_blank">mailto:extropy-chat-bounces@lists.extropy.org</a>] <b>On Behalf Of </b>Anders Sandberg<br></span><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">…</span></b><br><br><span style="color:#1f497d">>…</span>If we assume the energy release was around 10^50 J over a second, then the power per square meter at distance d is 10^50/(4 pi r^2) Watts. So the criticial distance if the danger power is P is r=sqrt(10^50/4 pi P). If we assume a megawatt/m^2 is enough to cause biosphere damage, then the distance is 298,000 lightyears. To wipe out more advanced civilizations I would expect a much higher P; for a gigawatt the range is 9,400 lightyears - bad in the central part of a galaxy, but not even covering it<span style="color:#1f497d">…<u></u><u></u></span></p></div></div><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#1f497d">Anders, cool, but we need to know how GW energy would interact with matter before we conclude that it would nuke biomes. <u></u><u></u></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:#1f497d">spike<u></u><u></u></span></p><pre><u></u> <u></u></pre></div></div></blockquote></div></div><blockquote type="cite"><div><span>_______________________________________________</span><span class=""><br><span>extropy-chat mailing list</span><br><span><a href="mailto:extropy-chat@lists.extropy.org" target="_blank">extropy-chat@lists.extropy.org</a></span><br><span><a href="http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat" target="_blank">http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat</a></span><br></span></div></blockquote></div><br>_______________________________________________<br>
extropy-chat mailing list<br>
<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a><br>
<a href="http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat" rel="noreferrer" target="_blank">http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat</a><br>
<br></blockquote></div><br></div>