Refraction - The bending of a wave when it travels from one material into another and changes speed, Diffraction - The spreading out of a wave without changing it's wavelength after a small gap or corner, Reflection - The bouncing of a wave of a surface at the same angle it hit it at, Doppler shift - The change in frequency and wavelength of a wave because the source of the wave is moving, Red shift - The moving of light to a longer wavelength when the light source (often a star or galaxy) is moving away from us, CMBR - Very red-shifted radiation left over from the beginning of the universe which is now microwaves, The electromagnetic spectrum - The collection of waves that are in fact all types of light, Frequency - The number of waves per second measured in Hertz,

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