The branch of science that deals with celestial objects, space, and the physical universe as a whole.

• A. Bathymetry
• B. Uranography
• C. Astronomy
• D. Hypsography

Answer: (C)

Studying celestial objects, space, and the physical universe as a whole is the domain of astronomy. This field covers everything from planets and stars to galaxies and the fundamental processes that govern the cosmos, offering a broad framework for understanding how the universe works. The other terms focus on very different areas: bathymetry measures ocean depths and seabed topography, hypsography maps elevations on Earth’s land surface, and uranography is a historical term for charting the heavens. While uranography relates to locating objects in the sky, astronomy is the established name for the science that studies the entire universe beyond Earth's atmosphere.