I’m pretty sure Professor X can tell if someone is a mutant or not.
Would an origin story lie?
God, let’s not turn this into another CRT thread, @Son_of_a_Rich. 
Likewise, can Professor X prove that his mother wasn’t bitten by a radioactive spider while pregnant?
I’m strongly against superhero theory taught at any level.
Fanwank: Different universe, different physics. Your laws do not apply.
That just moves the problem down the road.
Why should we care about people from different dimensions?
And why is only that law of physics different? Material strength, inertia, basic physics are all different, but HS kids still awkwardly pursue the cute girl and worry about homework? They listen to the exact pop stars as we do?
Couldn’t that be said about essentially any Fantasy or Sci-fi? The Force doesn’t exist, so why should I care about any characters in Star Wars?
When you change physics, that’s going to strongly affect whether life comes into existence in that universe. And, likewise, it will affect how that life behaves and interacts with its co-lifeforms.
But that’s all probabilities. You’re saying that they probably would not be similar to us, and that is true. They probably wouldn’t look human; they probably wouldn’t have a city named “New York”; they probably wouldn’t speak English; and they probably wouldn’t have the same emotional interactions that we do.
If the odds of all of that are 1 in 10^10^10, it doesn’t matter if there are 10^10^10^10^10 universes among the multiverses. The documentarians at Marvel will still have their prime choice of universes to pick from, to choose to cover.
Can’t argue with that!
I did appreciate in Into the Spiderverse that the “prime” universe that the movie occurred in wasn’t our universe. At first I thought they were just “movie-izing” NYC, until I realized.
I figure things like this are JFM (Just Freaking Magic)
What a “mutant” is in the Marvel Universe has fluctuated over the decades.
There are storylines where Spider-Man was among the first targets of the Sentinels in the mutant genocide because they considered him a mutant.
There were in-universe definitions by which those born with mutated genetics that allowed super-powers were mutants, while those, like Spider-Man and the Fantastic Four whose genetics were altered after they were born were mutates. Even when the writers remembered that and tried to pay attention to that distinction, different characters in-universe sometimes cared about that distinction and sometimes didn’t.
At one point it was official canon (I don’t know if it still is) that mutants by definition all carried the “X-gene”, and Spider-Man didn’t, so by definition he wasn’t a mutant.
And then there was the whole weird “That Which Endures” thing, where mutants were…created by? selected by? favored by? something to do with a…quasi-bacterial order of life which was present in all life on Earth but also only present in mutants? Or something? It was weird. So if Spider-Man were part of “That Which Endures” he would be a mutant…I think.
Plus there was the whole storyline where Spider-Man was actually the living totem of Anansi the Spider-God, and his powers were all actually derived from a mystical connection, and the spider bite was just Anansi’s method of marking Peter Parker as his Chosen, and the radioactive part had nothing to do with it. I think that’s been retconned away at this point, but I’m not sure.
Back in the 1980s, when TSR was publishing the Marvel Super Heroes roleplaying game, they made that exact distinction:
- Mutants were born with the genetic changes which gave them superpowers
- Altered humans (e.g., Spider-Man, the Fantastic Four, the Hulk) were normal humans who gained superpowers when their DNA was altered (often by radiation) after they were born.
Yup – sometimes “scary powers” are “scary powers,” and the average in-universe normal person may not care about where those powers came from.
He’s a teenage boy, right? I think they all do that.
(What?! The OP used the term “wankable”)
I wish Marvel hadn’t tried to link everything in the same universe. X-men and Avenger-types (and Blade! Seriously? Vampires in the same universe as Avengers?) should be in their own separate worlds.
Alas, they didn’t ask me. 
Ummm… don’t take this class. 
https://cos.gatech.edu/events/physics-and-materials-science-superheroes
One of the founding members of the Avengers is a literal Norse God, and you think vampires don’t fit in with that?
Also, the X-Men absolutely have to share a universe with other, non-hated superheroes, otherwise the entire prejudice metaphor falls apart.
Marvel definitely went through a “monster” phase in the late '60s and early '70s, and as a result, we got vampires and the like.
Not me. My mutant power is to not be detected as a mutant by psionic, magical, or technological means.
That’s kind of like saying that you wish grass wasn’t green. It has been part of Marvel comics forever. Even The Avengers was a crossover series built from characters from pre-existing comics. Why is it valid to cross over Captain America and Thor, but not Captain America and The X-Men? An explaination that doesn’t include “but the MCU!”