> If there were any type of particle that did not feel gravity, we could use that particle to send out a message from the inside of the black hole, so it wouldn

> If there were any type of particle that did not feel gravity, we could use that particle to send out a message from the inside of the black hole, so it wouldn’t actually be black. What about gravitational waves? Could you propagate a gravitational wave from inside the black hole to the outside? Or is it stopped at the event horizon?