General relativity predicts that time ends inside black holes because the gravitational collapse squeezes matter to infinite density.

Gravitational waves will bring us exquisitely accurate maps of black holes - maps of their space-time. Those maps will make it crystal clear whether or not what we're dealing with are black holes as described by general relativity.

Black holes destroy any objects that happen to fall victim to their gravitational pull.

A black hole is simply the end of space as we know it!

Things changed with the discovery of neutron stars and black holes - objects with gravitational fields so intense that dramatic space and time-warping effects occur.

There are no black holes in the sense of regimes from which light can't escape to infinity.