The Expanding Universe: Evidence for Acceleration - PowerPoint PPT Presentation


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Part 1: What is Hubble\'s Law?. In 1929 Edwin Hubble plotted the velocities of various galaxies vs. their distancesInterpretation: all galaxies are moving away from each other. Measuring Velocity by Doppler Effect. Light waves and sound waves spread outward in circles. If the source of waves is moving, then observer A will see these waves far apart (low frequency) while observer B sees them close together (high frequency).For sound waves, different frequencies are heard as different pitches. F1146

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