What keeps the matter in an HII region ionized?

Name: What keeps the matter in an HII region ionized?
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Quizplus · Accepted Answer

Ultraviolet radiation from a star or stars is the primary source of ionization in an HII region. The high energy photons emitted by these stars are absorbed by the surrounding gas, causing the gas atoms to lose electrons and become ionized. This process results in the HII region being filled with a plasma of ionized hydrogen gas.

What Keeps the Matter in an HII Region Ionized