Black hole worm hole gravity mass etc?

It would be a huge mess and would generate a lot of gravitational waves. This could now be calculated by a numerical solution of the Einstein Field Equations, but it hasn't been done as far as I know. This probably happens all the time on the Planck scale.

Yes, a star can enter a black hole, although depending on the mass of the black hole it will be tidally disrupted before it reaches the event horizon. Black holes can also merge. This happened a lot in the early Universe and has been extensively modeled because this phenomenon can be detected by gravity wave telescopes.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.