On the assumption that the supernova in 2387 originated outside the Romulan star system, is it at all possible that a star exploding in one system could be dangerous to the inhabitants of a nearby system? I think the supernova must have happened fairly close to the Romulan system for the shockwave to have reached it so quickly.
Gamma Ray Burst
Problem is speed aka lightyears. The Romulans would of had ages to get away if it was a star outside there system but the film makes you believe it was there own star. I stilll prefer the subspace thing that I posted a while back.