Ultrasound - Sound that has a higher frequency than 20000Hz, Geocentric - The idea that everything orbits and Earth, Wave - Disturbance or variation which travels through a medium., Isotope - An element with different neutrons, Radioactive - A atom that has more than 82 protons, Redshift - The movement of a planet moving away from us, Transformer - A machine that steps up and down electrical currents, Sankey Diagram - Graph that shows the effciency of energy usage, Infrasound - Uses for animal communication such as elephants and lions, Binary stars - Where two stars orbit one another, Supernova - Proto star, Massive star, Super Red Giant,..., Ritter - Man who discovered Ultraviolet, Hershal - Man who discover Infrared, Spectrometer - Tool used to analyse light given out by stars and galaxies, Milky way - Our galaxy, Optic Nerve - What does the retina send message to the brain through,

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