Event Horizon

This is where things get tricky- no, impossible.
The boundary. The edge.
Look- do you see that object falling towards it, falling forever, never quite reaching it, somehow slower and slower, as the redshift increases to infinity, and the intensity diminishes to zero, and you, you receive the doomed object’s last photon yet will never see it cross the horizon.
Or perhaps you yourself are willing to fall? To plunge over the edge, into the blackness, to the centre? And suddenly the mass of the hole has increased; the electric charge and angular momentum have changed.
And nothing escapes. You are not coming back.