[ExI] Gravitational Waves Detected By LIGO!

Tomaz Kristan protokol2020 at gmail.com
Sun Feb 14 18:56:06 UTC 2016

> How did you calculate that "
at least one every second
​" figure?​

10^11 galaxies with a supermassive black hole.

An average supermassive has about several 10^6 small black hole mass.

This is about several*10^17 small black holes already collided. Either as
two small black holes, either as a black hole and a (neutron) star, either
as supermassive an a star ...

The number of seconds after the Big Bang is also several*10^17.

Roughly one per second in the past, now it's probably much faster. But
perhaps bigger black holes collide now.

But roughly, we are there about.


>From 10^23 stars in our (observable) Universe and that at least 1 of 10000
stars in our own galaxy has already fallen to Sagittarius ... if this is an
average, then 10^19 stars has already fallen in. And they keep do that.

Roughly my numbers.

On Sun, Feb 14, 2016 at 5:06 PM, John Clark <johnkclark at gmail.com> wrote:

> On Sun, Feb 14, 2016 at 2:52 AM, Tomaz Kristan <protokol2020 at gmail.com>
> wrote:
> ​> ​
>> You may be right, The fact that LIGO is currently down can explain a lot.
>> 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.
>> ​  [...]​
>> By "rain" I mean at least one every second in the observable Universe.
>> Had to be, for number reasons.
> ​The number of gravity wave events that LIGO will be able to detect
> depends on:
> 1) How big the black holes that merge are.
> 2) How far away the black holes are.
> 3) How common the much weaker source of 2 neutron stars merging is.
> 4) How sensitive LIGO is.
> How did you calculate that "
> at least one every second
> ​" figure?​
>  John K Clark
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