<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Would that be strictly required though? <div><br></div><div>Suppose there are two galaxies passing through each other— can’t that result in two black holes passing each other and falling into a death spiral?</div><div><br></div><div>(I’m not up to date on the particulars of this merger)<br><br><div dir="ltr">SR Ballard</div><div dir="ltr"><br>On Sep 7, 2020, at 5:37 PM, spike jones via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><o:p> </o:p></p><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal">> <b>On Behalf Of </b>SR Ballard via extropy-chat<br><b>Subject:</b> Re: [ExI] black biggies<o:p></o:p></p></div></div><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt">Spike, you say the parent black holes would both be at the limits of current understanding. Couldn’t they just be the products of the collision of grandparent black holes? I assume that would be a “thing”?<o:p></o:p></p><div><p class="MsoNormal">SR<o:p></o:p></p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt">Ja sure is SR a way biggie thing it is.<o:p></o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt">From my understanding of it, the way big mergers happen is when two stars destined to merge originally formed, they had to be in pairs where they were gravitationally bound, but also had a close approach point. This bled off an enormous amount of angular momentum at each mutual perihelion, eventually causing a the two to merge, forming Mister 85. But if we initially had three, I don’t understand how the merger could have set up conditions likely to get a subsequent merger of Mister 66. <o:p></o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt">I am struggling to imagine two pairs each pair tightly bound to start with, and each of the pairs in a highly-elliptical orbit that close-approaches the other pair, with all four of the original stars being monsters. Oh that staggers the imagination.<o:p></o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt">Note: LIGO just turned on the past 5 yrs. We have gotten alllll thiiiiis in just the last 5 years, good new science out the old wazoo.<o:p></o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt">Staggering the imagination is a good thing in science: it indicates one is about to learn something new and wicked cool. I am getting that feeling about this. We are about to figure out something really cool just from this latest event.<o:p></o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt">spike<o:p></o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt"><br>On Sep 7, 2020, at 10:50 AM, spike jones via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<o:p></o:p></p></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><p class="MsoNormal"> <o:p></o:p></p><p class="MsoNormal">These LIGO results just keep blowing our minds. They recently announced a merger of two black holes of mass 85 and 66 solar masses, which I thought had to be a typo or a mistake when I first read it, but they claim it is true. That 85 sol black hole is too big to have formed by the usual path as we (or as I) understand it. <o:p></o:p></p><p class="MsoNormal"> <o:p></o:p></p><p class="MsoNormal">To be that size, it would hafta have formed by a previous black hole merger, and if so, that too is quite mysterious by my understanding of cosmology. Even the smaller of this pair is close to the limits of the standard model of black hole formation.<o:p></o:p></p><p class="MsoNormal"> <o:p></o:p></p><p class="MsoNormal">LIGO and now the European VIRGO both saw that merger happen. Those instruments have returned so much good science, oh what a marvelous time to be alive.<o:p></o:p></p><p class="MsoNormal"> <o:p></o:p></p><p class="MsoNormal">spike<o:p></o:p></p></div></blockquote><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><p class="MsoNormal">_______________________________________________<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">http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat</a><o:p></o:p></p></div></blockquote></div></div></blockquote><blockquote type="cite"><div dir="ltr"><span>_______________________________________________</span><br><span>extropy-chat mailing list</span><br><span><a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a></span><br><span><a href="http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat">http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat</a></span><br></div></blockquote></div></body></html>