<div dir="ltr"><font size="4">A new analysis in the journal Nature <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​by ​</div>Krzysztof Belczynski<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ ​</div>predicts that when LIGO<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ ​</div><font face="arial, helvetica, sans-serif">reaches<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ ​</div></font>full sensitivity in 3 <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​to​</div> 4 years it will <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​see ​</div>Black Hole mergers in the 20 to 80 solal mass range about once every 9 hours<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​,​</div> assuming the Black Holes came from dead stars and not from the first nanosecond of the Big Bang<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​,​</div> if some Black Holes are primordial it would happen more often. Since it's pretty easy to determine from how far away the gravitational waves <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​came ​</div>and with <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​at​</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> least a​</div> thousand <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​new ​</div>data points a year we should be able map out the entire universe, <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​including ​</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​both​</div> <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​dark matter</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> and regular matter</div>, with unprecedented detail. </font><div><font size="4"><br></font></div><div><font size="4">Unfortunately Belczynski<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ ​</div>also predicts we'll only see<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ ​</div>about<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ ​</div>one collision between 2 neutron stars a year because of their much weaker gravitational waves. Oh well you can't have everything.<br><br><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">​ ​</div>John K Clark</font></div></div>