As Magneto has control of magnetism, can he create darkness? Light itself is an electromagnetic wave, and eliminating the magnetic part of light might cause it to be “invisible” to the human eye.
First of all, you can't "eliminate the 'magenetic' part of light". That's not how physics works. You can ask on Physics.SE for extended details. Having said that, light is an electromagnetic phenomenon, and as such can be manipulated by Magneto according to canon:
He can also generate electromagnetic pulses of great strength and generate and manipulate electromagnetic energy down to photons. He can turn invisible by warping visible light around his body. - via Wikipedia, with ukltimate source Vision and the Scarlet Witch #4 (February 1983)
The short answer is yes. In the comic-book canon, Magneto demonstrates a wide range of powers that aren't seen in the films including a force-field strong enough to block the she-hulk and the ability to fly (whereas he only has the ability to influence metal in the films).
In "Vision and the Scarlet Witch : Vol 1 #4" we see him 'wrapping himself in a cocoon of metal' which he then uses to bend light around him;
The same cocoon apparently allows him to 'traverse vast distances of empty space' without a space suit.
Sort of. Maybe.
If we assume some semblance of physics as we currently know it, then Magneto cannot "create darkness", because darkness is not a "thing" one "creates". But he could prevent light from entering some space, which would then appear dark to people inside it. Or he could prevent light from leaving some space, which would then appear dark to people outside. Neither of these is quite the same thing as what you asked, but they might achieve similar purposes.
Then again, we're also talking about comic book superheroes. "Physics as we currently know it" may not be a very safe assumption.
I was looking for the actual Marvel Encyclopedia Entry, but no luck finding it online. However, several sources, from Wikipedia to fan made wiki's to the Marvel Database to a general Comic Book database seem to concur that Eric has an established control over the entire Electromagnetic spectrum.....
As a result of this, Magneto can logically manipulate all forms of energy which fall within that spectrum. These include [and I'm paraphrasing from the original encyclopedia article here] pure electricity, photons, light waves, heat waves, and even radio waves, though he is not as practiced in these forms as he is with pure magnetism.
There are examples of him using these other powers in the comics, but its been so many years and so many issues, I honestly am not sure where to begin searching.
Here's a picture of him generating pure electricity in Avengers: Disassembled ....
Here's one with him basically saying how he can control photons via his electromagnetism...
And here's an official Marvel informational describing some of his auxiliary powers...
Note this section here, highlighted by me. It literally states, flat out, how he can control infrared [basically the higher spectrum of light] energy and heat, as well as magnetism.
I think that pretty conclusively shows that, via his control over the EM spectrum, electricity, light and heat are well within his range of control.
Now, to be fair, this is not the same as "Creating darkness", which is essentially the absence of light. I think what is being asked here is one of 2 things:
- Can Magneto create dark matter?
- Can Magneto manipulate light to essentially remove all perceptible light from an area, thus shrouding it in darkness.
To which I would postulate..
- No. Darkmatter isn't just the "absence of light", but a complete other phenomenon. There has been no evidence to show Magnus has any control over that, but other Marvel characters [one of Galactus Heralds, I can't recall which exactly] does.
- Theoretically, yes, he can...though I know of no comics where he has yet. It's simply a matter of pulling all photos to him, or removing all visible light from a specific space.... its essentially the same way in which Sue Richards turns invisible. The difference being he wouldn't be doing it from one object, more so than reorganizing the patterns of waves or photons so that they don't "hit" our eyes, thus creating darkness.
Essentially, Magneto would be creating a similar effect of when there is a New Moon and no stars; because there is no perceivable light for our eyes to absorb bouncing off objects, it appears far darker than usual.