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Flat Earth Theory / Re: Doubt in Universal Acceleration
« on: June 12, 2020, 09:28:46 AM »The frame of reference is absolutely crucial. If you believe it to be irrelevant, simply choose your favourite one. I'll give you a hint, there are three FoR's that are worth considering here: a local observer standing atop the Earth, a local observer located immediately above the Earth who is initally at rest relative to the Earth, and an external inertial observer.
I said it's irrelevant because for an internal observer, the observed speed is zero (like it would be for an astronaut sitting on an accelerating spaceship) and, on the other hand, UA excludes the possibility of talking about "external" observers, let's say someone just below the place where an energy becomes acceleration, or someone outside the ice wall. UA is silent on the current knowledge of what is outside, but it doesn't deny it's existence, because it assumes that there is an energy the converts into movement in a direction.
If I'm accelerated in a direction and nothing is stopping me, I will acquire speed.Correct, but entirely irrelevant. The magnitude of that speed is the key point here, not the fact that it's increasing. Specifically, your claim that "the flat surface we would be on is now travelling upwards at quite a fast speed (incredibly greater than the speed of light)" contradicts basic physics. You cannot identify a frame of reference in which the Earth is moving faster than c without contradicting Special Relativity. As was the case previously, I suggest that throwing physics out the window is not the best way for you to defend RET.
Special Relativiy is safe, because what you cannot do is *measure* a speed faster than light in any frame of reference. But a traveller on a spaceship that is constantly accelerating at g toward a, let's say ten light years afar, star will reach it quicker than the speed of light, according *on the spaceship clock*, so it's indirectly a travel faster than the speed of light. The important difference with a travel that would really contradict SR is that the clocks on departure and destination will have run normally, that is faster than the spaceship clocks, and for them the spaceship has never went faster than the speed of light. But again, my main point is that the energy poured by the spaceship engines *must go somewhere*.
because you're not in a different system S' but you are on SIf you're on S, your speed relative to S is 0m/s, and the speed of S relative to you is 0m/s. That's significantly lower than c.
I'm referring to the whole system S, unknown-form-of-energy+earth-surface+the-visible-sky.
Summing up, I do understand that the whole UA describes the known universe as the inside of a spaceship, but still it doesn't rule out that fact that an energy is converting into acceleration in a direction. And this has, as a consequence, that we would *really* be on some sort of spaceship!