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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/7ae38382-9d59-44ca-b2eb-52326886b835%40googlegroups.com.
