👉 Unilluminated is a term used in the field of astronomy and astrophysics to describe a celestial body that is not illuminated by any visible light or other electromagnetic radiation. This can happen for various reasons, such as when an object has been partially obscured by another celestial body, or it may be due to a lack of sunlight or other natural sources of illumination. In the context of astronomy and astrophysics, unilluminated objects are often used in simulations of planetary systems to represent objects
