Various people are asking questions about gravity waves, most seem to be confused about what a gravity wave *is*.
Gravity waves are *changes* in gravity. In other words, changes in the local curvature of space-time. They are *not* emitted by the *existence* of a mass, but by changes in the position of the mass. Just like electromagenetic weaves are only emitted when a charge is *moved*.
So the light still gets trapped by the gravity of the black hole. Ad in so doing causes the emission of an *incredibly* weak gravity wave as it adds to the mass of the black hole.
To get strong gravity waves you need to move a *lot* of mass *rapidly*. Something like a "starquake" on a neutron star... (where due to cooling the surface may "crack" and suddnely cotract by a millimeter or so. That's a movement of at least gigatonnes of mass. (likely many, many orders of magnitude more, but I don't feel like calculating the mass of a 1 mm "shell" of neutronium that's 20 or so km in diameter)
Leonard Erickson [email removed]
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