| http://www.w3.org/ns/prov#value | - lines act as finger prints -used to identify the elements present and thus the star's chemical composition -Doppler effect -perceived change in wavelength of a wave that is emitted from a source that is moving away or toward an object -the light from a source that is moving away from an observer appears redder because the waves are lengthened -used to determine whether a star or other body in spac
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