Answer:
The effects of the Black Death were many and varied. Trade suffered for a time, and wars were temporarily abandoned. Many labourers died, which devastated families through lost means of survival and caused personal suffering; landowners who used labourers as tenant farmers were also affected.
The answer is making maps
A dead star does indeed becomes a black hole. In fact, even the sun will turn into a giant black hole and kill us all. (That's in millions of years, so something else will wipe out the human race)
Hope this helped! :P
