Silly questions?

I have a few questions re Traveller to the wise people on this list that
probably have been discussed already, but since I can't get to the
archives I'm going to ask them.

1. Is it possible to make pure fusion warheads in Traveller? If so, how
   small can they be usefully made? As they presumably would not be
   affected by nuclear dampers they would be quite devastating.

2. Is it possible for a starship to refuel from ice? If so then any
   iceball can provide fuel, including comets and other pieces of
   junk at the fringes of a system.

3. What happens to the Megacorporations in the Rebellion? Do they
   split up? If so who gets to own them? This isn't a problem for the
   Vilani megacorps, but the others are diversified.

I expectantly await some answers
                                     Tom O'Neill
can