lars573 said:
Well we use the term break bones wrong here. What should be being said is you have to break limbs. Break as in make them not able to function. You twist a persons arm beind there back and pull out, the arm is broken. That is you've torn up all the ligaments and tendons in that arms elbow and shoulder. It's not easy to do but it's possible.
Now as too what is and isn't possible in regards to superheroes.
Possible today;
Batman
Green Arrow/Hawkeye
Black Widow
Ironman (well a lesser version that lacks flight and repulsors)
Near future;
Captain America
Impopssible given how the laws of the universe work;
Superman- (or any character with super strength) his level of strength is impossible due to physics. If he tried to lift a building or airliners he'd snap it in two. The tiny (relatively) surface area of his hands would be pressing into the concrete or aluminum or the bulding or plane would exert to much force and he would break the surfce of the building or plane.
Giantman- (or any large character) even if you could somehow trigger a man to grow to 60 foot tall it woujld be too dangerous for him to move around. Why? Physics again. Being 100 more massive than a normal man would mean that his body would be 100 times more affected by gravity. so unless his bones were 100 times more dense stubbing his toe on a car could shatter every bone in his foot. Falling over would kill him. His spine would be minced, his skull would shatter. For example elephants are kept in their encloshiers in zoos buy a simple charin linked fence and a 4 foot deep trench. What keeps the in their cage is the trench. They know that falling into a hole only 4 feet deep would break their bones. This is due to their over all mass.
Green lantern
Flash
Wasp/Atom (or any shrinker)
Hawkman/Hawkgirl/Angel -in nature there are no 6 limbed vertabreates. Limbs are arms legs or wings. Tails are extentions of the spine. Leaving that aside, wingspan of a flying animal has to be 2:1 in terms of surface area. Plus to fly you need to be light. Birds do this via hollow bones. So a flying humanoid would too. Therefore Hawkman would be 30% lighter than a normal man his size due to hollow bones. And his wings would have to be 2x bigger or he'd never fly anywhere.
I don't see a Captain America without some form of collapsable muscle.
Either way, Superman's strength is a possibility. Our muscle structures aren't capable of that sort of load bearing, but another one might. As for his holding up buildings, that's unlikely, but that's not really a factor of strength. The physics doesn't mind his strength, just the physics of him holding up a building.
Giant Man would be able to move around just fine. He's a proportionate character, and would operate proportionally. His only physics problem is a conservation problem, where he basically gains all sorts of mass out of nothing.
Green Lantern? That's sort of different. A mechanism that could control energy isn't exactly an impossibility. We simply don't know how to do it, thought it would be a series of refracting energies to hold things in place. Though the whole living in space via them are obviously impossible.
However, the Hawkman dillemma is an otherwise thing. Just because beings like them don't exist on Earth, doesn't force the idea they don't exist elsewhere. Should you have a totally dense structure that can fly as they do? No. But the idea of them isn't exactly without possibility.
Flash is a possibility. Someone who's skin is chemically stable enough to withstand extremely high energy gains, with extremely non-friction joints is a good possibility. The only problem is the whole atoms not being able to retain so much energy at such high speeds. Several times the speed of sound is fine, but once is you start accelerating in the 30% and up the speed of light, his atoms would break apart and just kill him.
And Wasp and Atom are obviously impossible due to laws of physics.