👉 In astronomy, "sublunary" refers to a celestial body that is less than one astronomical unit (AU) from the Sun. This means it orbits around the Sun but has no visible light or atmosphere, making it invisible to the naked eye. Sublunary objects are important for understanding the structure of the solar system and the formation of stars in our galaxy. They provide a unique perspective on the solar system that is often difficult to obtain from other celestial bodies.
