[ExI] LIGO just announced 4 more Black Hole collisions

[John Clark]

On Tue, Dec 4, 2018 at 4:18 PM <spike at rainier66.com> wrote:


> > *Hoooowwwww how how howwwww how the hell… can there be so damn many of
> these marvelous things this late in the day, this long since the Big Bang?
> John are you finding this as puzzling as I am? *
>

Absolutely! this is fun!


> > Now we have nearly a dozen in three years.
>

The LIGO people now estimate there are 53 Black Hole mergers per year
withing 3 billion light years, and when it come back on line early next
year with the new upgrades LIGO should be able to see them all; although
there is great uncertainty in that number, it could be as few as 25 or as
many as 108. And if its big enough LIGO can see further than that, even
without the new improvements it spotted one 6 billion light years away.

 >  I didn’t think LIGO was a good investment of science money.


I was starting to think it was a boondoggle too, shows you what I know.

> Now, oh how happy I am to have been so wrong on that.


Me too!

 > *LIGO has been the best science fixed-asset investment since Hubble,
> maybe better than Hubble.*


Yep, I can't think of anything where we got more bang for the buck.


> >  I soooo don’t understand the BB model now.
>

Welcome to the club. It's hard to see how all of those Black Holes could
have come from dead giant stars, some of them must be primordial. I could
be wrong but I have a hunch they will provide at least a partial answer to
the Dark Matter puzzle.

John K Clark
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