The bright stars at the center of an emission nebula (H II region) are

Name: The bright stars at the center of an emission nebula (H II region) are
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Emission nebulae, or H II regions, are often illuminated by young, hot, massive stars, typically of spectral types O and B. These stars emit large amounts of ultraviolet light, which ionizes the surrounding gas, causing it to emit its own light and thus creating the visible nebula.

The Bright Stars at the Center of an Emission Nebula