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Guess The Spectra!! Beginner! Advanced! Mystery #1! M57: The Ring Nebula! Mystery #2! Mystery #3! The Sun! Blue Star: HII Gas Cloud: Rigel! Eta Carinae! Spiral Galaxy! Guess The Spectra!! Beginner! Advanced! If you guessed a combination of Hydrogen and Sodium spectra then you are correct! Planetary Nebula have emission lines due to energy emitted from the central star. The Ring Nebula has spectral lines from Hydrogen, Helium, and Oxygen! If you guessed a combination of Hydrogen and Helium spectra then you are correct! Rigel is made of mostly Hydrogen and Helium like the Sun, but is a different color! The color difference is due to temperature. Rigel is 2x as hot as the Sun so it appears blue! If you guessed a combination of Helium and Mercury spectra then you are correct! HII Clouds are mostly made of Hydrogen and emit spectra when nearby stars transfer energy to them. Like planetary nebula, these clouds may also contain Helium and Oxygen. Since the Sun is so hot, its spectra is a continuous rainbow with black absorption lines marking different elements. The Sun is made of mostly Hydrogen and Helium. Galaxies are made of billions of stars, gas clouds, and nebulae. Therefore the spectra of a galaxy is the combination of all of these pieces! Can you see how they fit together? Spiral Galaxy M17: The Ring Nebula Blue Star: Rigel HII Gas Cloud The Sun Hydrogen Helium Carbon Nitrogen Oxygen Iron Neon Mercury Sodium