the branch of astronomy concerned with the physical and chemical properties of celestial bodies

pertaining to the branch of astronomy dealing with the origin and history and structure and dynamics of the universe

(cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature

(cosmology) the theory that the solar system evolved from a hot gaseous nebula

(cosmology) the theory that the solar system was formed by the gravitational accumulation of planetesimals

(cosmology) the theory that the universe maintains a constant average density with matter created to fill the void left by galaxies that are receding from each other

(cosmology) the cosmic explosion that is hypothesized to have marked the origin of the universe