Nova Cannon

Got a question about the Nova Cannon...

Movement occurs before firing/moving the nova "ball".  What if
a ship travels through the fireball during the ship's movement.  Does it

take damage?  If so, does it take last turn's Nova cannon damage
or this turns.	If it's this turns, do I first replace the template
size?  What if, by doing so the ship doesn't hit the fireball?

Confused...

Peter Caron