I will come right out here and admit.

Yes, I'm stupid

I don't see how acceleration and uniform motion coexist?

As someone good wrote to me as I asked

"Am I right in understanding that all frames of reference relative each other, no matter if they're accelerating or just 'coasting', will give those 'results'."

His answer was as follows..

" Unfortunately, no. When two frames are coasting relative to each other, you'll get one result. If one frame is accelerating, you'll get a different result. And, if two frames start with no motion relative to each other and one accelerates away, coasts, and then returns to no motion relative to each other, you'll get still another result. When there's no acceleration, the (relatively simple) rules of special relativity apply. With acceleration, the far more complicated rules of general relativity apply. "

Now according to the rules of the general theory of relativity.

You know:)

" gravity is just a curvature of the geometry of spacetime.

An observer in free fall no longer feels his own weight."

" One can produce gravity in gravity free space merely by reversing the process.

Acceleration creates a gravitational field"

This is in fact Einsteins "principle of equivalence."

And the idea that created 'spacetime'.

So by treating an object (you:) placed near/at a much bigger object (Earth) you could treat it as.

Something in a 'free fall' together 'attracting each other'.

As you could see it as an object of invariant mass having one G 'attracting you' as you it.

In fact, viewed that way you are both 'falling' towards each other.

Or if you like

Accelerating at each other.

Like, something constantly trying to 'push' you uniformly, at one G.

And when you fall you are in fact going back to an 'inert' state, if I get it right.

But Uniform motion (coasting) is not the same as accelerating and therefore does not,

As far as I understand, create the 'age differences' experienced in the accelerating 'twin experiment'.

That sounds okey to me, but then I have this difficulty with the twin experiment.

In it we have 'someone' inside an accelerating frame versus his twin that stays at their original 'coasting' frame (Earth).

The first twin is accelerating at, let us define it as a 'steady' one G, going to some star, then turning back.

Accelerating and decelerating towards Earth and that 'original' frame, but at no 'place' accelerating over that one G.

Will there be a age-difference shown between the twins?

As I understand it there will be.

But how?

If me accelerating at one G is the same as me 'pushed' by Earths invariant mass of one G?

Where does it differ?

Am I mis/stating/understanding the 'equivalence principle ' here?

Explain it as simple as you can, and I will be you eternally grateful:)

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How does two objects 'pushing/pulling at each other differ from a accelerated object?

In the accelerated object the so called 'gravity well' was placed behind the stern?

In fact it was placed where no invariant matter exist.

Can there be any 'gravity wells' defined to those other two objects?

We say that gravity is a product of spacetime 'adapting' itself to invariant mass, am I right in that?

So in this case?