HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would totally destroy the hydrogen atoms in the gas.

Name: HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would totally destroy the hydrogen atoms in the gas.
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HII regions are found near hot, young stars that are much hotter than 25,000 K because their large amounts of ultraviolet photons ionize the hydrogen atoms in the gas, not destroy them.

HII Regions Are Found near Stars Cooler Than 25,000 K