E=mc^2
This famous equation from Albert Einstein's Theory of General Relativity basically says that Matter and Energy are basically different forms of the same phenomenon.
That means you can transform matter into a predictable amount of energy....and transform energy into a predictable amount of matter.
That's essentially what our Ghosts do when they resurrect us after a death...and what the "transporter" from Star Treck and the "trans-mat" from Destiny does when our sparrow instantly manifests from orbit or we instantly dematerialize to our jumpship.
What probably happens is that our Ghost draws upon the Traveller's Light as an energy source, and then uses that energy to replicate a duplicate of us....right down the sub-atomic level. Which is why we come back with our memories intact.
Why we have no memory of our lives before our initial resurrection (we were dead, and Ghosts have no way of knowing what our sub-atomic (quantum) state was prior to our deaths......
... why we cannot be rezzed without our Ghosts.
..and why, when we were cut off from the Traveller, our Ghosts could only heal us, rather than resurrect us (not enough energy).
TLDR: Our Ghosts probably retain a molecular "blueprint" of our bodies, and then reconstruct us from that pattern when we're killed. So as long as our Ghosts are intact...and have access to enough Light...they can simply rebuild us.
Like the Trans-mat does.
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That's what I thought, but I wanted to explore that concept further. Because I thought perhaps if they could recreate us, then they could change parts about us?
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They probably could....but why would they want to? Our Ghosts picked us for a reason....and altering us may interfere with that rationale in ways we dont' fully understand. Remember. All we understand is that the Light "works"....we don't understand "how" or "why"?
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Well my 'why would they want to' is because say the Guardian wants to, or heck, maybe they need to. If something about a Guardian's physical form was taking a toll on their mental health, wouldn't that mean it would be for the best for the Ghost to help change that if they had the power to? And just cuz we don't know how the light works, doesn't mean we cant fill in the gaps with what we feel makes sense. That's the wonder of fiction!