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 actually found near hot stars with temperatures greater than 25,000 K, as these stars emit enough ultraviolet photons to ionize hydrogen atoms in the surrounding gas.

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