We usually find dark molecular clouds beside bright emission nebulae.

Name: We usually find dark molecular clouds beside bright emission nebulae.
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Dark molecular clouds often exist adjacent to bright emission nebulae because the intense ultraviolet light from nearby hot stars ionizes the gas of the emission nebula, causing it to glow, while the dark clouds remain cool and dense, absorbing background light rather than emitting it.

We Usually Find Dark Molecular Clouds Beside Bright Emission Nebulae