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Spectral Tube Principles Illustrated: Various gaseous elements emit different spectra of light. These spectra are indicative of the types of gasses present. Using a spectroscope and a spectral tube, students can break down this light in order to analyze its components. This method is similar to that used by scientists to determine the types of gasses that make up stars. Standards Addressed: 8th grade Physical Science- CA standard Earth in the Solar System (Earth Sciences) 4. The structure and composition of the universe can be learned from studying stars and galaxies and their evolution. As a basis for understanding this concept: 2. Students know that the Sun is one of many stars in the Milky Way galaxy and that stars may differ in size, temperature, and color. 4. Students know that stars are the source of light for all bright objects in outer space and that the Moon and planets shine by reflected sunlight, not by their own light. 5. Students know the appearance, general composition, relative position and size, and motion of objects in the solar system, including planets, planetary satellites, comets, and asteroids. Materials: