HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would 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 destroy the hydrogen atoms in the gas.
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HII regions are found near hot stars with temperatures above 25,000 K because these stars emit enough ultraviolet photons to ionize hydrogen atoms, creating the HII regions.

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