The two behave quite differently, and follow different mathematical laws.
There is no medium in space, and electromagnetic radiation does not require a medium. Indeed, it slows down in any medium.
As I suggested on another forum, take continuing education classes at your local community college and take Intro to Physics.
There is no evidence of the existence of tacyhons. Massless particles can only travel at the speed of light. Your use of the word theory is incorrect, what you have is a conjecture at best.
If you have any mathematics to support your idea, lets see it.
Yes. They would have to be homogeneous in distribution through the galaxy, gravitationally active, and non-reactive with the electromagnetic spectrum.
Hmmm, sounds like dark matter.
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