Goku hands down would win the fight against Superman. Superman weakness is magic and krypt... Goku weakness....none. Superman is not a push over since he can move at Godlike speed.reverse time, freeze, shoot lasers, juggle tanks, get revive from death from the sun... That being said Goku can easily destroy the sun... theoretically speaking if piccolo can blow up the moon "understanding it being very small in mass compare to the sun" he did it at a very low level power in the beginning... Goku at his final stage "was that guy" he can destroy anything...superman is only brute strength were Goku have martial arts, dragon flame shit, (forgot the name),kamehame wave, spirit bomb, solar flare,tri technique, kaio ken, super saiyan levels... Goku would win in the long run... question is could Goku breathe in space? not sure if anyone mention it earlier...Couldn't say i recall anything were Goku was in space without a space suit which doesn't matter really cause Goku can teleport anywhere he wants , he even teleport to save his son while he was dead.... now that is very Gangsta. I apologize for the horrible grammar had some nyquil earlier and some muscles relaxes sprain the shit out of my leg in pain