What characteristic is responsible for the dark patches within the Flame Nebula?

Answer

Dense dust clouds blocking the background light originating from energized gas.

The Flame Nebula contains complex internal structures where dense accumulations of dust absorb or block the light emitted by the hot gas situated behind them, leading to areas that appear dark.

What characteristic is responsible for the dark patches within the Flame Nebula?
lightastronomystarsconstellationOrionOrion's belt