> On Jun 15, 2016, at 23:48 , Brent Meeker <[email protected]> wrote: > > When you look somewhere new, you see new things. To bad Joe Weber didn't > live to see this. > > Brent
And Bob Forward (Robert L. Forward), who was once Weber's grad student, and continued gravity related research and publication until his death in 2002. > > On 6/15/2016 7:25 PM, John Clark wrote: >> After analyzing the data from LIGO's brief engineering run the scientists >> there just announced they have found a second Black Hole merger. A Black >> Hole of 14 solar masses merged with one of 8 solar masses and produced a >> Black Hole of 21 solar masses and gravitational waves with 1 solar mass of >> energy. It happened 1.4 billion light years away, about the same distance as >> the first merger that was announced a few months ago, but the signal was >> weaker because the Black Holes involved were smaller (14 and 8 vs 36 and 29) >> and also because the orbit of the Black Holes was more edge on relative to >> the Earth. Edge on means the signal is weaker but it also means it's easier >> to determine the spin, so unlike the first detection this time we can say >> with certainty that at least one of the Black Holes was spinning. And >> although weaker the signal lasted longer, almost a full second versus a >> fifth of a second the first time because being smaller the holes generated >> waves with higher frequencies that LIGO is more sensitive to. >> >> And they're looking at at least one other suspected merger but they're only >> 85% certain it's real and that's not good enough to claim discovery, but >> there may be others so there may be a third announcement before long. Not >> bad for observing for only 18 days. The instrument was running at only one >> third power but that was still good enough to determine that 2 mirrors 4 >> kilometers apart had changed their distance by less than a billionth of a >> nanometer. I can't wait for September when the 2 LIGOs get back online and >> are joined by a third detector, VIRGO in Italy. >> >> http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.241103 >> >> John K Clark >> -- >> 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 post to this group, send email to [email protected]. >> Visit this group at https://groups.google.com/group/everything-list. >> For more options, visit https://groups.google.com/d/optout. > > > -- > 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 post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. -- 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 post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
