Lesson
Lesson-20.1.5- describe the red-shift in light received from galaxies at different distances away from the Earth.
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Lesson-20.1.4- use the equation relating change in wavelength, wavelength, velocity of a galaxy and the speed of light: reference wavelength/change in wavelength=velocity of a galaxy/speed of light (???????0)/??0=????/??0 =v/cPreviousLesson-20.1.6- explain why the red-shift of galaxies provides evidence for the expansion of the universe.Next