You are right dennis, and I apologize.
I am sorry Madeline S. And I hope you
forgive me. It seems I all too soon forget
how much I wanted to learn when I was younger.
And as a response to Dennis, I was saying that
the mass of the black hole would be as much or less
than the star it used to be. If the sun, for example,
"magically" turned into a black hole (agin this IS
hypothetical, since our sun is not massive enough), every
planet would maintain their same orbits. It is a fact and
in fact there is an equation for the force of gravity on
an object. If the black hole were to suck up a planet, it
would have to have gained more mass so that its gravity would
be stronger. The equation is something like F=(gm1m2)/(d^2)...
I hope this clarifies things a little further.