Which field of study focuses on the origin and evolution of the universe and its large-scale structure?

• A. Astronomy
• B. Cosmology
• C. Astrophysics
• D. Geology

Answer: (B)

Cosmology is the study of the origin and evolution of the universe and its large-scale structure. It focuses on big-picture questions like how the universe began, how it has expanded over time, and how matter is arranged on the largest scales into galaxies, clusters, and the cosmic web. This makes it the best fit for a question about the universe as a whole, rather than about individual celestial objects or rocks on Earth.

Astronomy covers a wide range of celestial phenomena and objects, but not necessarily the history of the universe as a whole. Astrophysics applies physical laws to understand specific objects and processes within the cosmos, which can include cosmological topics but often centers on stars, black holes, and galaxies themselves. Geology studies the Earth’s materials and history, which is unrelated to the origin and evolution of the universe. Observational evidence like the expansion of the universe and the cosmic microwave background underpins cosmology and helps reveal the universe’s large-scale structure.