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Explain how astronomers learn the composition of a gas by examining its spectral lines Discuss the three types of spectra. Sketch them. Explain the behavior of electrons within atoms and how electrons interact with light to move among energy levels. Explain how emission line spectra and absorption line spectra are formed Explain why the spectral lines of photons we observe from an object will change as a result of the objects motion toward or away from us. A sketch might be helpful. Describe how we can use the Doppler effect to deduce how astronomical objects are moving through space.
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