Aerospace science refers to the study and exploration of the Earth's atmosphere and space beyond. Synonyms for this term are many and varied, including "aeronautics," which refers specifically to the study and design of aircraft. "Aviation science" is similar, focusing more on the technological and engineering aspects of flying. "Space science" encompasses the study of the universe beyond our planet, including celestial bodies and phenomenon such as galaxies, black holes, and gravitational waves. "Astrophysics," "astronomy," and "cosmology" all deal specifically with the physics and nature of space and the cosmos. Finally, "planetary science" refers to the study of planets within our solar system and their environments and features.