The most "pseudo-scientific" explanation came from the 1986 reboot "Man of Steel", by John Byrne. He explained that Superman's flight and invulnerability are due to a telekinetic aura that surrounds his body (which explains why his skintight costume couldn't be damaged, while his cape or civilian clothes got shredded up easily).Mass is a measure of the resistance of an object to a change in its state of motion.
Superman flying can't be exerting force using his muscles. He's not bracing himself on something else, he's bracing himself ON HIMSELF, on his position in the universe.
Yet he can also absorb tremendous physical impacts, such as bullets, though a good punch from a powerhouse will send him flying.
So does Superman have great Mass?
If he does, does his flight overwhelm that Mass/inertia enough to move it around the world?
Is it his flight that's really strong? Or even a force in addition to his body that is also strong?
Waddaya think of that?
(note: not a physicist)
Supes' intestines super-compress methane & other waste gasses, which he then uses for thrust in controlled bursts.
It also explains why his cape is always flapping.
The planet Krypton was the galaxy's single largest source of the rare element Handwavium.
Along with Daxxam! Let's not forget Daxxam!
The most "pseudo-scientific" explanation came from the 1986 reboot "Man of Steel", by John Byrne. He explained that Superman's flight and invulnerability are due to a telekinetic aura that surrounds his body (which explains why his skintight costume couldn't be damaged, while his cape or civilian clothes got shredded up easily).
This aura allowed Superman to lift enormous things without compromising their integrity, as it would support the object as well. And when Superman flew, he actually became capable of lifting more than what he could while on the ground.
In trying to replicate this aura in a clone of Superman, Cadmus labs ended up giving the would-be Superboy his Tactile Telekinesis.