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This simulation shows high school students how scientists detect the movement of a star by examining its spectral adsorption lines. The introduction explains the positive relationship between wavelength and the distance light travels. It also provides tips for interpreting the position of the adsorption lines on the spectrum. Students are instructed to click either the Away or Toward button. After they have used the speedometer to set the star's speed relative to the Earth, they can observe the movement of the spectral lines and compare the lines with a reference spectrum from a stationary star. Copyright 2005 Eisenhower National Clearinghouse
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