2. The branch of astrophysics that studies the origin, evolutionary behavior, and structure of the universe as a whole.
3. The study of the origin of celestial objects, usually referring to the solar system.
4. A specific theory or model, myth, or of the origin and evolution of the universe.
While early cosmogonical theories were limited to the problem of the origin of our planetary system, modern cosmogony embraces the study of the origin of giant stellar galaxies, single and multiple stars, planetary systems in general and, finally, the origin of atoms of various chemical elements which constitute the universe.