If sound travels through matter what medium does light travel through? [duplicate]

This question already has an answer here:

So sound is a wave and is basically just vibrations, an atom vibrates causing another next to it vibrate and so on until it finally reaches our ears to become sound.

If that's normally how waves behaves, what about light? I understand it's also a particle but something must have caused its starting point to influence its next point in space thereby allowing it to travel through space. what is the cause and effect relationship that allows light to propagate through space? I ruled out matter because most visible light is blocked by matter.

marked as duplicate by ACuriousMind♦, Kyle Oman, Kyle Kanos, Brandon Enright, John RennieSep 4 '14 at 5:26

• "Why don't electromagnetic waves require a medium?": physics.stackexchange.com/q/19670/9887 – Alfred Centauri Sep 3 '14 at 22:57
• You essentially are asking whether there is a luminiferous aether, there isn't, see the linked question by Alfred Centauri. – ACuriousMind Sep 3 '14 at 23:07
• Am I supposed to accept the fact that there is no cause and effect relationship of light at t = 1 that affects where light will be located in space at t = 2? – Mike Sep 3 '14 at 23:10
• Well, since EM waves propagate, the EM field configuration at one point very well influences the EM field configuration at other point. It is just the case that there is no carrier of these waves - they evidently need no aether, but are oscillations of the EM field itself. (Side note: Cause and effect become, when viewed through the lens of relativity (and electromagnetism is the archetypical special relativistic phenomenon), notions you will want to think very carefully about before using them.) – ACuriousMind Sep 3 '14 at 23:32

$$\nabla\cdot{\bf D} = \rho$$ $$\nabla\cdot{\bf B} = 0$$ $$\nabla\times{\bf E} = - {{\partial{\bf B}}\over{\partial t}}$$ $$\nabla\times{\bf H} = {\bf J} + {{\partial{\bf D}}\over{\partial t}}$$
The original source of electromagnetic waves is some oscillating charge (for instance an electron) which has an electric field around it. This field is changing (because the charge is oscillating). Therefore (according to the fourth equation) a magnetic field $H$ is formed. But the creation of magnetic field is in fact a change in magnetic field. This leads (according to the third equation) to creation of new electric field $E$. But this change in $E$ leads to $H$, which leads to $E$, etc.