Yeah, I was a friend of friend of Bob Forward and I once had dinner with
him. At the time though he was pushing anti-matter powered spaceships;
which I thought was a crank idea.
Brent
On 6/16/2016 5:18 AM, Hans Moravec wrote:
On Jun 15, 2016, at 23:48 , Brent Meeker <meeke...@verizon.net> 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
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