LIGO found out another G wave

Technically they probably are, but the amount of energy released from those events is so tiny that it's practically undetectable. It took two black holes colliding to release a signal strong enough for LIGO to detect- read up on LIGO's sensitivity to get an idea of how weak the signal really is.

If you draw two sphere at the centers of two LIGO detectors, won't they intersect at a circle?

So again, how do you pinpoint he origin of the wave?

It's not just timing. They also have information from the phase an the amplitude of the signal.

No. LISA a proposed space based detector from the European Space Agency will detect supermassive black hole binaries and collisions (as well as other things) to constrain galaxy formation, cosmology and gravitational physics. These events are though to be quite rare however but not destructive.

The power of gravitational waves emitted by the Earth-Sun system is the same as a typical lightbulb, 10's of watts. It's tiny and it's very long wavelength. To have something detectable with LIGO it needs to be ten's to hundreds of hertz and have a huge amount of mass moving.

They aren't unobservable then are they?

>It's not just timing. They also have information from the phase an the amplitude of the signal.
I have no idea how that stuff works. What's a good book/course reference for this?

>how do they know the masses of two black holes that are colliding?

The relative masses change the shape of the waveform before the collision.

>The power of gravitational waves emitted by the Earth-Sun system is the same as a typical lightbulb, 10's of watts. It's tiny and it's very long wavelength. To have something detectable with LIGO it needs to be ten's to hundreds of hertz and have a huge amount of mass moving.

Why? How does that correlate to the massive gravity of the Earth and the Sun? Those tiny waves somehow exert forces multiple orders of magnitude above their size?

The only book I've really ever glanced at on the topic is Saulson, Fundamentals of interferometric gravitational wave detectors. I can't say I've read it, I've only really done GWs from a theoretical perspective with Schutz A First Course in General Relativity, it's a good book but not light reading.

Most of what I know is from undergrad, I went to a LIGO heavy department.

Gravitational waves do not mediate gravity in GR. They are special solutions to GR. A massive body in uniform motion for example generates no gravitational waves. It still has a gravitational field though. No changing quadrapolar moment, no gravitational waves.

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