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

Basic Concepts:

• brown dwarfBrown dwarfs are sub- stellar objects (~13 to 75 Jupiter masses) that never fuse hydrogen into helium in their cores, as do stars on the main sequence. They do fuse deuterium. A useful criterion for telling brown dwarfs from low mass stars is obtained thrs
• gas giant planets
• terrestrial planetA terrestrial planet is a planet which is primarily composed of silicate rocks. The term is derived from the Latin word for Earth, Terra , so an alternate definition would be that these are planets which are, in some notable fashion, "Earth-like". Terrests
• icy moonIcy moon s are believed to be a common class of planetoids that have a surface mostly of ice, possibly with an ocean under the ice, and possibly including a rocky core of silicate or metallic rocks. The prototype of this class of object is Europa. Icy moos
• asteroidAn asteroid is a small, solid object in our Solar System, orbiting the Sun. An asteroid is an example of a minor planet (or planetoid , which are much smaller than planets. The asteroids are believed to be remnants of the protoplanetary disc which were nos
• comets
• earthquake
• equatorial bulge
• Kuiper belt
• magnetosphere
• the Pluto debate
• precession
• the Sun
• solar-terrestrial interaction
• space weather
• synchronous rotation
• extrasolar planets
• super Jupiter