Movement of light relative to what?

[Maloof?]

This idea has been at the back of my mind for a week or so now, so I thought I'd share it.

The speed of light is constant in a vacuum. This means that if you fire a laser from a moving spaceship, the beam will always travel at 2.9E8 m/s. A missle, on the other hand, would have inertia and momentum from the movement of the spaceship, so a missle fired from a moving ship would travel faster than a missle fired from a stationary ship.

What is the speed of light relative to? We can measure the speed of the Earth relative to the Sun, or relative to the centre of the Milky Way, but what can we use as a landmark for measuring light?

Unless our Solar System can be considered an isolated system in terms of light experiments, I just can't accept that light moves relative to us.

Have we done any experiments to measure what light moves relative to? I would have to theorise that there is some universal constant (not dissimilar to Aether) that light moves in relation to. This could even be the centre of the universe (it would be a logical reference point).

Could we test this? If we were to send a light source into space, far enough away from the gravitational pull of any large bodies, what would happen? If light is moving relative to some point or area of the sky, would we see the light emitted to be red-shifted in the direction of the reference point and blue shifted in the other direction (which would thus be the direction of universal expansion for the light source)?

Just something to think about. Feel free to poke holes in this theory. I know I will when I'm awake enough to go back over it.

[highlight](User was banned for this post ("Missed the Other Sped of light thread" - RayvenQ))[/highlight]

[Stud Muffin]

Speed of light is relative to stationary objects.

[Maloof?]

[QUOTE=Stud Muffin;17190546]Speed of light is relative to stationary objects.[/QUOTE]

Once again, stationary relative to what? Relative to us, the Sun could be considered stationary, but the Sun isn't stationary relative to the centre of the Milky Way.