There are several synonyms for the term "astronomical object," which refers to any entity in space that is of scientific interest. One common synonym is "celestial body," which encompasses everything from planets and stars to comets and asteroids. Another synonym is "cosmic entity," which emphasizes the mysterious and complex nature of these objects. Some scientists also use the term "heavenly body" to refer to astronomical objects, which highlights their place in the cosmos. Alternatively, the term "astronomical phenomenon" can be used to describe a particular event or occurrence in space, such as a supernova or a black hole. Overall, there is no lack of synonyms to describe the vast and awe-inspiring objects that make up our universe.