IGCSE Physics - Astrophysics Formulae 0.0 / 5 ? PhysicsEquations and FormulaeIGCSEEdexcel Created by: Andreas_AntoniouCreated on: 06-05-19 09:17 Orbital Speed Orbital Speed = (2 x π x orbital radius) / time 1 of 5 Equation relating change in wavelength, wavelength, velocity of a galaxy and the speed of light = (change in wavelength / reference wavelength) = (velocity of galaxy / speed of light) 2 of 5 Universe Universe = a large collection of billions of galaxies 3 of 5 Galaxy Galaxy = a large collection of billions of stars 4 of 5 Milky Way Milky Way = our galaxy 5 of 5
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