• noun the study of natural objects in space, including earth
  • The study of objects in the heavens and of the Earth as an object in space, including their history and development and that of the universe as a whole. Astronomy is perhaps the most ancient of the sciences, since all known cultures have or have had ideas about the Cosmos. Modern astronomy is related closely to other sciences, especially physics, and has many subdivisions, most notably cosmology and astrophysics.

Not what you were looking for?