[norwaypinesavage]

"Two beams traveling in opposite directions at the speed of light are relatively traveling at twice the speed of light."

The reason it's called the "Special theory of relativity" is that your calculation does not hold true. It's physics, not math.

[OldNavyVet]

First note, everything aobut physics involves math ...

Second note ... From the Internet.

Red Shift & Blue Shift A light source moving away from the listener (v is positive) would provide an fL that is less than fS. In the visible light spectrum, this causes a shift toward the red end of the light spectrum, so it is called a red shift. When the light source is moving toward the listener (v is negative), then fL is greater than fS. In the visible light spectrum, this causes a shift toward the high-frequency end of the light spectrum.

Adding to that, two objects parting at more than the speed of light would not be visible to each other.

[SgtHooper]

And because of that, it sucks in enormous amounts of funding.