<div dir="ltr">By "rain" I mean at least one every second in the observable Universe. Had to be, for number reasons.</div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 14, 2016 at 8:52 AM, Tomaz Kristan <span dir="ltr"><<a href="mailto:protokol2020@gmail.com" target="_blank">protokol2020@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="ltr">You may be right, The fact that LIGO is currently down can explain a lot. <div><br></div><div>But when it will go online again, we will see. If there will not be very frequent detections, of a much greater events also, this one was a fluke. For there is a constant rain of black holes onto those supermassives. Have to be.</div><div><br></div><div>We will see. </div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Sun, Feb 14, 2016 at 1:04 AM, John Clark <span dir="ltr"><<a href="mailto:johnkclark@gmail.com" target="_blank">johnkclark@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr"><span><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif">On Sat, Feb 13, 2016 Tomaz Kristan </span><span dir="ltr" style="font-family:arial,sans-serif"><<a href="mailto:protokol2020@gmail.com" target="_blank">protokol2020@gmail.com</a>></span><span style="font-family:arial,sans-serif"> wrote:</span><br></div></span><div class="gmail_extra"><div class="gmail_quote"><span><font size="4"><br></font><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><font size="4"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">> </div>Those giant black holes, have swollen millions of black holes during past 10 billion years.<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div></font><span style="font-size:large">Each. And there are billion of them. Many such occurrences every year, even every day.<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div></span><span style="font-size:large">We do not detect those. </span></div></div></blockquote><div><font size="4"><br></font></div></span><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="4">That is true; determining when the distance between two mirrors 2 and a half miles apart changes by 1/10,000 the width of a proton is hard.</font></div></div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><span style="font-size:large"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">> </div>Why?</span></div></div></blockquote><div><br></div><div><font size="4"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">Be patient</div>. To the surprise of everybody LIGO detected the big signal and several smaller signals during a short engineering run when it was only at a third of it's design sensitivity. Until very recently the LIGO people were telling everybody that they didn't expect to see anything<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> interesting </div>until 2017 or 2018, and when they did find something they expected it <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">would </div>come from 2 neutron stars or a neutron <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">star</div> and a 8 or 9 mass black hole<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">,</div> not from 36 and 29 mass black holes merging, but <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"></div>apparently<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> such things and gravity waves in general are more common than had been thought.</div></font></div><div><font size="4"><br></font></div><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"><font size="4">LIGO is shut down right now so it can be twerked to reach designed sensitivity but will come back online in late summer; that's about the same time the European Advanced VIRGO detector starts up and it might be even more sensitive. When that happens finding a new gravity wave event every day may not be unrealistic. </font></div></div><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"><font size="4"><br></font></div></div><div><font size="4"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> John K Clark </div> </font></div><div><br></div></div></div></div>
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