On Friday, August 16, 2019 at 5:35:44 AM UTC-5, John Clark wrote: > > Yesterday August 14 2019 LIGO detected for the first time Gravitational > Waves coming from a Black Hole-Neutron Star merger; it was 900 million > light years away. They detected something like this a few months ago but > were only 13% confident it was real, this time the signal was much stronger > and they're 99% confident. They've narrowed the source down to a square 23 > degrees on a side, so far they haven't detected any electromagnetic waves > from it but have just started looking. This type of merger produces a > cleaner signal that is easier to analyze than when two Black Holes merge > and can provide a more rigorous test of General Relativity, and if you > could spot a few dozen of these sort of mergers it could give us the best > value yet of the Hubble constant which has been in dispute lately and > perhaps tell us if we're heading for the Big Rip or not. > > LIGO and Virgo spotted the first black hole swallowing up a neutron star > <https://www.sciencenews.org/article/ligo-virgo-gravitational-waves-first-black-hole-swallowing-neutron-star> > > John K Clark >
I am not sure how this is cleaner, for there is a lot of material dynamics that is complicated. Black hole coalescence is a pure vacuum problem. It is though interesting still. LC -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/7ae38382-9d59-44ca-b2eb-52326886b835%40googlegroups.com.
