What is the transfer of energy through space by electromagnetic waves?
An electromagnetic wave is a oscillation through 2 fields, electrical and magnetic fields of the space the wave is travelling through. These oscillations are at right angles to each other. Electromagnetic waves are carried by miniscule particles of energy called photons, Light itself is one of the forms of electromagnetic waves and all EM waves travel at the speed of light 3x10^8 ms or 300 000 000 metres per second. Photons have 0 mass. Nothing with mass can truly have a higher velocity then the speed of light or EM radiation. As they are carried by photons they need no medium to travel through and can therefore travel through space/a vacuum.