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| Description: Most stars have a dark-line spectrum Instrument used to spread out the light is called a spectroscope Doppler effect The apparent change in wavelength of radiation caused by the relative motions of the source and observer Used to determine Direction of motion Increasing distance – wavelength is longer (“stretches”) Decreasing distance – makes wavelength shorter (“compresses”) Velocity – larger Doppler shifts indicate higher velocities Picture Stats: Views: 297 Filesize: 628.25kB Height: 577 Width: 1398 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39769 |