@ohgodwhy: If they fuse into gogeta ssj2 they will be more than 100x stronger so.. gogeta ssj2 can destroy sun easily
@eddz99: Afraid not. SS2 Gogeta has a power level 2,500,000,000 which if you put into my calculations still not enough power to destroy the Sun. It's not his official power level but it's the closest thing we have.
He might be able to trigger some kind of reaction which could cause the Sun to explode but I don't think he has the power to make the Sun explode using his own power.