Suppose the HelioSphere

caused redshift of incoming light?
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- The heliosphere is the bubble-like region of space dominated by the Sun, which extends far beyond the orbit of Pluto. Plasma "blown" out from the Sun, known as the solar wind, creates and maintains this bubble against the outside pressure of the interstellar medium, the hydrogen and helium gas that permeates the Milky Way Galaxy. The solar wind flows outward from the Sun until encountering the termination shock, where motion slows abruptly. The Voyager spacecraft have explored the outer reaches of the heliosphere, passing through the shock and entering the heliosheath, a transitional region which is in turn bounded by the outermost edge of the heliosphere, called the heliopause. The shape of the heliosphere is controlled by the interstellar medium through which it is traveling, as well as the Sun and is not perfectly spherical.[1] The limited data available and unexplored nature of these structures have resulted in many theories.[2] The word "heliosphere" is said to have been coined by Alexander J. Dessler, who is credited with first use of the word in the scientific literature.[3]
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On September 12, 2013, NASA announced that Voyager 1 left the heliopause on August 25, 2012, when it measured a sudden increase in plasma density of about forty times.[4] Because the heliopause marks one boundary between the Sun's solar wind and the rest of the galaxy, a spacecraft such as Voyager 1 which has departed the heliosphere, can be said to have reached interstellar space.
According to Voyager 1 there's some there there.
Why would it NOT cause a redshift?
If that's the case what does it say about the big bang theory?
I found this question pretty interesting, as I am pretty skeptical of most cosmological theory presently promulgated. There are a lot of assumptions, and little evidence to back much of it up.
So, I looked about.
I found this site, which discusses how plasma can interact with light, such that 'laser-induced structures in plasma that act as high-power mirrors.' are being used in efforts to fuse atoms.
There's more, but your thesis that plasma might impact light is definitely proved by the fact that plasmas both are used to reflect lasers and aim them, and are manipulated by lasers to make them act as mirrors.
It is almost certain the heliopause impacts the light passing through it.
and they didn't know it was there...until they sent the probe.
Still requires a lot of exploring.Too much unknown at this point
like I said...why would it not?
a 'shell' of plasma...forty times thicker than what's inside of it.
Don't you think that would have some effect on light pass thru it?
Guess that's only logical... Agreed