A luminous body is any celestial or astronomical object that emits its own light, such as stars, planets, or moons. Synonyms for luminous body include celestial body, astronomical body, heavenly body, and celestial object. These terms are often used interchangeably in astronomy and can refer to any object in space, visible or otherwise. Other synonyms for luminous body are luminary or orb, which are often used when referring to the sun or the moon. Additionally, the term cosmos is sometimes used to describe the entirety of the celestial bodies in space. All of these terms are essential in understanding the vastness and complexity of the universe.