primary wave - Longitudinal seismic wave, secondary wave - Transverse seismic wave, radio wave - Electromagnetic wave with the longest wave length, gamma rays - Electromagnetic wave with the shortest wavelength, beta - Radiation which emits electrons, gamma - The most dangerous type of radiation, refraction - The change of speed/direction when a wave enters a new material, nebular - The first stage of every star, blue shift - When a star s moving towards something making the wavelengths shorter, ultra sound - Sounds above 20000Hz, infra sound - Sounds below 20Hz, power station - A series of buildings that generate electricity, generator - A machine that induces electrical currents, transverse - Waves that move at right angles to the direction of movement of area, seismic waves - Waves produced by an explosion or earthquake that travel through the earth, Aristotle - He believed the earth was at the centre of the entire universe, three - How many moons did Galileo believe that Jupiter had?, white dwarf - The final stage of an average sized star,

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