Which element usually produces the red color in nebulae?, Hydrogen, Oxygen, Helium, Why do some nebulae look blue?, Because they are very hot, Because they reflect the light of nearby stars, Because they contain space fire, The green color generally indicates the presence of:, Ionized oxygen, Hydrogen, Dark dust, What do dark nebulae do?, They emit a lot of light, They reflect blue light, They block the light behind them, How is the violet or purple color produced?, By space ice, By the absence of stars, By mixtures of red and blue light , Where are many stars born?, In nebulae, In black holes, On planets, Do the colors in space photographs always look the same to the human eye?, Yes, No, Only from the moon, What can produce yellow or orange colors?, Mixtures of gases and hot dust, Frozen water, Shadows from planets, What do scientists use to study nebulae?, Microscopes, Only weather satelities, Telescopes, Why are nebulae important?, Because they produce artificial gravity, Because they help us understand how the universe evolves, Because they create eclipses.

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