Thanks!
And do you have any idea how they derive masses of two black holes that are colliding?
LIGO found out another G wave
Ayden Lewis
Easton Gonzalez
So you're saying the waves are only generated during a CHANGE in gravity?
Juan Adams
They are invisible, not unobservable
Leo Gomez
Waves are generated when the source of gravity moves
Alexander Sanchez
Its like the doppler effect but with the strength of gravity rather than the wavelength of light
Charles Bennett
It's like classical dipole EM waves. If you have a static charge there is no emission. If you have an accelerating charge which then has a changing dipole moment you get EM waves. With gravitational radiation it's the quadrupolar moment instead.
Two bodies in circular orbits around each other emit gravitational waves, the gravity at neither is changing.
Gavin Hill
Carter Miller
Invisible is a shitty word too. They do not directly reflect photons. For actually practical purposes, you might as well say distant planets don't either. Considering gravitational lensing, they are more "visible" than said distant planets.
And if we're talking about "well if you were hypothetically near one it would be invisible" - what about the photon sphere?