Nebulae is a term used to describe an interstellar cloud of gas and dust in space. These clouds are often found within galaxies, and they can contain stars that are still forming or have already formed but not yet ignited their nuclear fuel. Nebulae come in various shapes and sizes, with some being large enough to encompass entire star-forming regions while others may be smaller and more compact. Some of the most famous nebulae include the Orion Nebula, the Eagle Nebula, and the Ring Nebula.