What is Spacetime?

Discussion in 'Astronomy, Exobiology, & Cosmology' started by Nobody, Oct 22, 2011.

  1. Aqueous Id flat Earth skeptic Valued Senior Member

    I find this to be sort of a quintessential definition of spacetime: it is that which propagates light at a velocity that that is equal to the geometric mean of its electric permittivity and magnetic permeability.

    So those are the actual intrinsic properties of space as opposed to imagined attributes, like fluid, particulate or aether.

    Another way to restate what I said, is that space and time are related in the first derivative, a constant, c, which in turn is merely the geometric mean of the two components of its intrinsic impedance - permittivity and permeability. That's the so-called "fabric" or aether folks tend to be referring to.
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