One Answer

  1. This is a question of philosophy rather than physics. If only for the reason that I can't think of anything that physics could say is “impossible to move or destroy” (in the usual everyday sense).

    “What cannot be stopped” is massless particles and waves. When they encounter something that they cannot overcome( pass through), they are absorbed (disappear).

    So I think the most realistic answer to your question is that what cannot be stopped will either pass through or be absorbed by what cannot be moved.

    P. S. I have seen references to a similar question being asked by some philosophers. “What will happen if the irresistible is directed to the unshakable?” I haven't seen an answer to this question.

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