Terrestrial geology is the study of the earth, which is a terrestrial body. Terrestrial geology differs from planetary geology, which is the study of other planets.

Billy P. Glass has written:

'Introduction to planetary geology' -- subject(s): Geology, Planets

Jeffrey B. Plescia has written:

'A bibliography of planetary geology principal investigators and their associates, 1981-1982' -- subject(s): Bibliography, Space sciences, Planets, Geology

'A bibliography of planetary geology principal investigators and their associates, 1982-1983' -- subject(s): Bibliography, Space sciences, Planets, Geology

Planetary science is an interdisciplinary study, involving physics, geology, astronomy, environmental studies, and other fields, which tries to understand what planets are made of, how they operate, and differences between them in the known universe. This is done by analyzing the key features of planets and their systems.

Planetary science (and rarely, planetology) is the name given to the scientific discipline of the study of planets. This subdivides into more specific disciplines, including planetary astronomy, planetary geology, and geophysics.