How Is an H II Region Formed

question 175

Multiple Choice

How is an H II region formed?

• A) In a supernova explosion, large amounts of hydrogen are ionized, and this forms the H II region.
• B) They are remnants of the earliest period in the universe when only hygrogen existed. They were ionized when the cosmic microwave background radiation was released.
• C) They are hydrogen clouds ionized by the radiation from hot O and B type stars.
• D) They are hydrogen clouds ionized in the eruption of the T-Tauri phase of the star that they surround.

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