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IANAP but, let me confuse you some more:
A vacuum is not the same as absolute nothingness. A vacuum just means the average energy is minimal (vacuum energy). In a vacuum particles suddenly exist out of nowhere and are usually annihilated shortly after. Google the Casimir effect. It is even possible that a stable particle forms, although very unlikely. Some go as far to theorize there is even a tiny chance something like a car suddenly forms out of nowhere (and even that this is how the big bang started).
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You are basically touching on Quantum Mechanics here if I am not mistaken, so.... do particles suddenly appear and vanish inside our bodies or does that only happen in the vacuum of space and why? I learned that the ratio of unstable particles to stable particles is 1 to 100 million... so all the matter that we see is literally 1 millionth of the particles that are possible...
However, that still leaves me a bit dumbfounded. Particles appearing and vanishing from space sounds pretty unstable to me... and yet we can stand on solid ground as we hurdle through space.... how can space, being so volatile and unpredictable hold our solar system in place?