Adamantium. Arguably the toughest metal in the Marvel universe. It has shrugged off Hulk punches and bludgeons from Thor's hammer. The question I pose however is, would Superman be able to break/dent it? He can after all, do [url=http://media.comicvine.com/uploads/6/67064/2081435-supermansuper_strength_super.jpg]this.[/url] (Not even his greatest strength feat)
I'd imagine it would be like one of those unstoppable forces meets and immovable object kind of thing.
EDIT: No sundips and no punches that involve flight or speed. Just a regular ass standing on the ground punch.
EDIT 2: Changed from Vibranium to Adamantium because Adamantium evidently seems more durable.
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Edited by DELIVER ME MEMES: 3/12/2013 9:13:24 PMbetter question...how did he have a son? the super money shot would likely hit Lois Lane with the force of a gunshot, killing her instantly, if not requiring immediate hospitalization. the average human male is around 20-25MPH in "money" speed. now multiply that times super man who can go on a transglobal run in seconds and you have huge velocities. if he's the strongest thing in the DC version of this solar system, it would be like he was internally stabbing her with a razor sharp knife-boner over and over again since he would literally be "harder than diamonds".