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  1. What is the space-time medium?

  2. According to this answer: "... fields are a fundamental part of the universe." Then why do we describe a gravity as being depressions in space-time?

  3. And why don't we describe weak, strong, or electromagnetic forces as such?

  4. Have we actually proved that there is no substance that makes space-time?

  5. Also is there a difference between the ideas of aether and quantum foam?

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closed as too broad by ACuriousMind, lemon, Qmechanic Mar 27 '16 at 15:11

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ There are too many questions here, but each of them is either a duplicate or doesn't really make sense: For "describing electromagnetic forces as such", see Geometric interpretation of Electromagnetism. What does "describing a gravitational field as propagating through some space-time sheet" mean? What would it mean to "prove" (or disprove) that there is a "substance that makes space-time"? What exactly are you referring to when you say "quantum foam"? $\endgroup$ – ACuriousMind Mar 27 '16 at 13:09