Banner installed a failsafe because of what he said "to prevent him from going green and basically on a rampage". He took this before the fight, that scene happened moments later before the fight. Lol... to what again? to prevent himself from GOING GREEN WITH RAGE". Why would the writer even put that part in there if it wasn't for a reason. Lol.
So....you ARE saying that Banner deliberately, in the midst of battle, reverted himself back in case he damaged puny Sun God too much/damaged the Earth (which they were going to blow up anyway) too much?
Can the Jovian change colors like the Hulk? Don't know why you keep bringing him into this. I'm asking you why pieces of Hulk body was green and both eyes were green while his body wasn't the same color. If the lighting in the area turns green to grey, why be nitpicky with it? Everything concerning green should be grey, right? Parts of Hulk body and his eyes didn't match a lot of his body. Banner took an injection to prevent himself from Wilding out (i guess so that he will not attack his team mates). He tells us what the antidote does. It's clear cut Dark.
That's not what I am saying. Hulk was knocked out. Sun God did it. What I am saying is, Hulk wasn't at his prime. He took a serum to prevent himself from turning into his strongest incarnation. He took this before the fight. Why? So that he will not go green. Which is the reason why a green Hulk isnt fighting sun god. This isn't hard to comprehend.
That planet IS illuminated by a reddish source, that much is obvious.
Allow me to go through some physics. Objects can appear colored due to two reasons: they can emit light themselves (i.e. act as light sources) or they can reflect ambient light. The color which is seen depends on the wavelength(s) of the light which are coming off of the object.
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The wavelength of green light is somewhere around 530 nm (nanometers).
Now if the object EMITS green light, you will always see it as green, because your eyes will then receive light with this ca. 530 nm wavelength. However, if the object is colored (due to pigment) but non-emitting, its observed color depends on the color of the illumination. Green pigment absorbs all the other wavelengths from the light but green which gets reflected and seen (roughly speaking). If such an object is illuminated with white light it will appear green because white light is composed of all colors. All but green gets absorbed. However, if the object is illuminated by RED/AMBER light, it cannot reflect green because there are no green wavelengths present in the incoming light to begin with. It will appear grayish.
Hulk's eyes appear green because they intrinsically emit green light whenever Hulk is angry. Just have a look at your avatar, Carver.