Implement Super Nova and Nova

Mostly, stars are a nuisance and just get in your
way. You can trigger a star into going nova by shooting one of your
photon torpedoes at it. When a star novas, it does a lot of damage
to anything immediately adjacent to it. If another star is adjacent
to a nova, it too will go nova. Stars may also occasionally go
supernova; a supernova in a quadrant destroys everything in the
quadrant and makes the quadrant permanently uninhabitable. You may
"jump over" a quadrant containing a supernova when you move, but you
should not stop there.

Supernovas may happen spontaneously, without provocation. If a
supernova occurs in the same quadrant you are in, your starship has
an "emergency automatic override" which picks some random direction
and some random warp factor, and tries to throw you clear of the
supernova. If the supernova occurs in some other quadrant, you just
get a warning message from Starfleet about it (provided, of course,
that your subspace radio is working).