What Color Is an H I Region

question 56

Multiple Choice

What color is an H I region?

• A)red from ionized hydrogen's alpha transition, such as in the Orion Nebula
• B)red from reddening due to dust
• C)colorless; it emits in the radio region
• D)blue from the scattering of light off the tiny atoms, such as around the Pleiades
• E)blue from ionized helium's alpha transition, such as the Horsehead Nebula

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