I just read an article on i09 about this, and here what’s strikes me as wrong.
Take the example of two stars rotating around each other and heading towards the observer.
Now,i f you posit an ether through which the lights moves…
IL: Now, wait minute…
EC: Ok, posit a fixed grid of coordinates extending beyond and behind the object upon which you can measure them…
EC: …and then take that ether you just created as the medium for light to travel in.
Continuing, now also take that ether as a gravitational field, essentially the same as the substances (planets, stars, people, etc) but not as dense.That is, the etherial background is a gravitational mass (or the limit of it) and things within that background are denser versions of the same. Thus, where the ones stops, the other begins. Where the planet’s edge stops, the ether starts. In reality, this would be more of a continuum, as less and less dense matter is held to the planet, and it becomes thinner and thinner until it thins out to the bare minimum that is the ether.
With this scenario, it follows that the traditional ‘additive’ experiments and/or thought experiments have not been valid demonstrations, for they posit a “moving” object, typically a star, that is emitting light as it moves. If, however, the star is a sectionally more dense portion of a continuous gravitational ether, the emitted light, needing to move through something, cannot possibly have gained any speed from what has been called the star’s “motion”: the motion of the light begins in the ether where the physicality — and therefore the “motion” — of the star ends.
Thus you would not see more than two star images in that example, not because light supposed always travels at the same speed, but rather because it does not travel through matter of more than a certain sectional density.
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In order for an additive experiment to exist, a situation must performed where light, itself already moving, emits more light, which would then be compared with the original light. The old example of traveling at the speed of light and then turning the headlights on is not so much the relevant question, but rather if light, traveling at whatever speed, emits more light, what happens? The clear theoretical answer is that the newly emitted light will travel at the speed of the medium in which it is in — regardless of what speed the previous light was traveling at.
Compare with stories of light being slowed down in glass and prisms and so forth.