(21 pages) This activity is an easy and effective introduction to spectra. Learning about spectra is interesting and important because each element’s spectra is like a fingerprint - no two are exactly alike. Incredible! Spectra are obtained from a star’s light, and it has been said that perhaps 75% of everything we know about the cosmos is due to spectroscopic studies. A star's spectra provides astronomers with clues as to the star's age, mass, motion, temperature, and destiny. In this activity, DARK LINE spectra are used, and students determine the different elements (2 or 3) present in a gas sample based on the dark line spectra produced. This is one of our Station Cards cooperative learning activities, and sixteen practice stations, labels, and answers are included.