Dark nebula is a term used to describe a cloud of interstellar dust that appears opaque and absorbs the background light. However, there are several other terms used to describe this type of celestial object. Some of the alternatives include absorption nebula, obscuring nebula, and dust cloud. Another synonym for a dark nebula is a molecular cloud. These clouds form a dense network of gas and dust that provides a site for star formation. These terms are often used interchangeably to describe clusters of gas and dust in space that obscure the light of stars behind them and create beautiful and mysterious images in the night sky.