On Sunday, June 17, 2012 11:39:57 AM UTC-5, Szczepan Bialek wrote:
All physisists (not teachers) are opinion that in space is enough matter to
propagate the electric waves.

I'm not sure about the "all" but indeed in space is enough matter to propagate the EM waves. But it is DARK MATTER, consisting of a different kind of matter with which none of us are presently familiar. Dark matter particles possess a certain observable mass but are clearly not electrons. The density of electrons in free space has been sampled by space probes and there's simply not enough electrons to support EM wave propagation in free space.

Do yourself a favor and concentrate on discovering what the "sea of dark matter" is all about. Dark matter is estimated to occupy 84% of all the matter in the universe and one thing is certain - it is not leptons of which electrons are a group member.