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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> extropy-chat [mailto:extropy-chat-bounces@lists.extropy.org] <b>On Behalf Of </b>John Clark<br><b>Sent:</b> Tuesday, December 13, 2016 7:18 AM<br><b>To:</b> ExI chat list <extropy-chat@lists.extropy.org><br><b>Subject:</b> Re: [ExI] Tabby's star<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif'>On Mon, Dec 12, 2016 at 12:07 PM, spike <<a href="mailto:spike66@att.net" target="_blank">spike66@att.net</a>> wrote:<o:p></o:p></span></p></div><div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><p class=MsoNormal style='margin-left:11.55pt'><span style='font-family:"Arial",sans-serif'>> >…If we gather all the metals available in the system into one big lump, we end up with a sphere perhaps thrice to five times the diameter of the earth…<o:p></o:p></span></p></div></blockquote><div><div><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>>…I think the consensus is Jupiter does a rocky core and its between 12 and 45 times earth's mass… John K Clark</span><span style='font-size:9.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>Ja I heard Saturn might have a core as well. I will settle for anything that gets the total rocky mass to anywhere between 1E26 and 1E27, then pick your favorite order of magnitude. My guess is 27 is the right OoM.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>Step one in any engineering exercise is the bound the problem. Having all the rocky mass together in one lump is one extreme which trades away everything for proximity: latency is minimized. With that solution, it maximizes heat control problem, since every bit that is flipped way down below the surface needs to have the resulting heat hauled all the way up to the surface and radiated away.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>We can imagine splitting the mass into two closely-orbiting masses, or ten perhaps and see that in exchange for accepting some additional latency, we get more surface area, more access to cold space for radiating heat, less wasted matter which is under too much pressure to make computing material. It is easy enough to imagine a stable orbit with those ten spheres, or a hundred earth-sized spheres orbiting in a plane evenly spaced 3.6 degrees apart at 1 AU, so latency about 30 seconds between them, about half an hour latency between to two nodes opposite the star assuming relayed transmission.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>Now we can repeat the thought experiment assuming 1000 rocky masses, each with about a Mercury mass, about 3 seconds latency between two adjacent nodes, 10k masses with about a lunar mass each, and so on.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>With that thought experiment, it quickly becomes clear that (from my understanding of what computronium would be for) the solution assuming FERP is getting better as we divide the masses by ten and multiply their number by one OoM. We can also clearly see there is a logical endgame: at some point the individual nodes get too small. But starting at one big rocky lump and working down is helpful.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>Starting at dust-sized particles and moving up is more difficult methinks, but I am listening if someone here has the expertise to start imagining a reasonable scenario starting on that end.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>spike <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div></div></div><div><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'> </span><span style='font-family:"Arial",sans-serif'><o:p></o:p></span></p></div></div></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>