Planetary science, also known as planetology or planetary astronomy, is the science of planets and the solar system, and incorporates an interdisciplinary approach drawing from diverse sciences. Planetary science may be considered a part of the Earth sciences, or more logically, as its parent field. Research tends to be done by a combination of astronomy, space exploration (particularly unmanned space missions), and comparative, experimental and meteorite work based on Earth. There is also an important theoretical component and considerable use of computer simulation.

Planetary science studies objects ranging in size from micrometeoroids to gas giants, their composition, dynamics and history.

When the discipline concerns itself with a celestial body in particular, a specialised term is used, as shown in the table below (only Heliology, Earth science, Selenology, and Areology are currently in common use):

Body	Term
Sun	Heliology
Mercury	Hermeology
Venus	Cytherology
Earth	Earth science
Moon	Selenology
Mars	Areology
Jupiter	Zenology
Saturn	Kronology
Uranus	Uranology
Neptune	Poseidology
Pluto	Hadeology

Basic Concepts:

• planet

• asteroids
• brown dwarfs
• comets
• earthquake
• equatorial bulge
• extrasolar planets
• gas giant planets
• icy moons
• Kuiper belt
• magnetosphere
• planetary differentiation
• the Pluto debate
• precession
• solar-terrestrial interaction
• space weather
• the Sun
• synchronous rotation
• super Jupiter
• terrestrial planets

See also

• Astrogeology