vorter, first you have to design a substance to coat the nukes with, otherwise once they get within x miles away, the sun's heat would cause one of two things 1) melt the bomb or 2) cause an early explosion.
and theoretically ozzy, it wouldn't take that much power, all you have to do is propel a "super-explosive" object into the suns core, detonate it, and in theory... the sun would destroy itself because the explosion would cause fusion to occur in the center of the sun and therefor all the hydrogen would become used in fusion and the sun would no longer have any hydrogren left to burn. *purely theoretical*
[edit]Jason posted about the 10 x thing while i was writing my post[/edit]