You could have sci-fi'd a supernova being that... Powerful? Too bad it didn't get explained at all... Comics don't count. You shouldn't need comics to understand a plot point for a movie.
Just for fun let's make up bullcrap they could have put in...
New Subspace weapon experiment that failed and the Romulans accidentally made a star explode with the weapon, but instead of being a normal super nova, the energy went into Subspace through some sci-fi mumbo jumbo and threatened....maybe not the whole galaxy (Spock might have just exaggerated lol), but a lot of star systems as the powerful subspace explosion discharged at medium warp speed, and would take a long time to dissipate enough.
Or whatever else... Because no normal star exploding will threaten the whole galaxy.
Edit: Noticed Romulans auto-corrected to Romans lol.
Just for fun let's make up bullcrap they could have put in...
New Subspace weapon experiment that failed and the Romulans accidentally made a star explode with the weapon, but instead of being a normal super nova, the energy went into Subspace through some sci-fi mumbo jumbo and threatened....maybe not the whole galaxy (Spock might have just exaggerated lol), but a lot of star systems as the powerful subspace explosion discharged at medium warp speed, and would take a long time to dissipate enough.
Or whatever else... Because no normal star exploding will threaten the whole galaxy.
Edit: Noticed Romulans auto-corrected to Romans lol.
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