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However 'space' is not the empty nothingness envisaged 100 years ago, but is now termed the 'interstellar medium' (ISM) or intergalactic (IGM) and the 'quantum vacuum' is considered as 'teeming with activity', now also from the 'Higgs field' which promotes condensed matter (normally termed 'pair production'.

in Earth's ionospheric shock particle densities are up to 10^14/cm^-3. Mainly considered as electorns. Hight Electron or 'dark matter' densities also exist in the heliosheath (solar system bow shock) and galactic halo. For a real picture of another suns heliosheath lit up by nebula gas Google NASA LL Orionis.

So em waves may not in theory need 'matter' to propagate, but atomic scattering means they are charging and being re-emitted by particles continually, and any CHANGE in their optical angles (paths) or wavelengths (so frequencies) does require coupling interaction with matter (the foundational mechanism of refraction).

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