Beats me. Perhaps it turns the supernova back into a star? OTOH, his actual wording is that it's gonna "absorb the exploding star" - perhaps this means that if an explosion does happen, then a properly placed black hole will protect Romulus by absorbing the part of the blast that would otherwise hit the planet, so Romulus can thumb its nose at the passing wave and then continue orbiting a white dwarf.
That's just a matter of interpreting and speculating, though. What the movie shows and tells is a separate thing, and the movie shows and tells that the homestar of Romulus blows. Alternate, disagreeing interpretations won't help.
Say, let's say it was Hobus, somewhere out in the sticks, that blew. Turning it into a black hole might not directly kill anybody. But Spock thinks it's his sacred duty to drop the red matter into the blast wave even after Romulus turns to dust. That won't touch Hobus, not across all those lightyears (we know well enough what red matter does, from the other times it gets applied in the movie). And not only will it not save Romulus, it will fail to save the galaxy, because the wave will continue its merry rampage in every other direction.
Keeping the action local keeps it within the potency envelope of red matter as defined in the movie (a droplet or a whole barrelful only creates this barely Narada-sized hole with a bit of pull across visual ranges but none across interstellar ranges). If we must, we can say Spock dropped a series of vials to stop the supernova, but we can't ramp that up to ridiculous numbers. OTOH, it would be helpful if Spock indeed created a series of black holes - all the more plausible for Nero and him to fall into one of those, then...
Timo Saloniemi
That's just a matter of interpreting and speculating, though. What the movie shows and tells is a separate thing, and the movie shows and tells that the homestar of Romulus blows. Alternate, disagreeing interpretations won't help.
Say, let's say it was Hobus, somewhere out in the sticks, that blew. Turning it into a black hole might not directly kill anybody. But Spock thinks it's his sacred duty to drop the red matter into the blast wave even after Romulus turns to dust. That won't touch Hobus, not across all those lightyears (we know well enough what red matter does, from the other times it gets applied in the movie). And not only will it not save Romulus, it will fail to save the galaxy, because the wave will continue its merry rampage in every other direction.
Keeping the action local keeps it within the potency envelope of red matter as defined in the movie (a droplet or a whole barrelful only creates this barely Narada-sized hole with a bit of pull across visual ranges but none across interstellar ranges). If we must, we can say Spock dropped a series of vials to stop the supernova, but we can't ramp that up to ridiculous numbers. OTOH, it would be helpful if Spock indeed created a series of black holes - all the more plausible for Nero and him to fall into one of those, then...
Timo Saloniemi