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A celestial body is any object ranging in size from an asteroid to a sun.
The most common size of celestial body is a planetary mass. Celestial bodies come in a large number of shapes although the most common shape is spherical.
Celestial bodies usually have a breathable atmosphere, although bodies without atmospheres or with poisonous atmospheres exist. The depth of an atmosphere is usually related to the size of the body.
Celestial Body Classification
Spacefarers use a standard system to categorise celestial bodies.
Size classes give information about the diameter of a celestial body:
- Size A - Less than 10 miles in diameter
- Size B - 10-100 miles in diameter
- Size C - 100-1,000 miles in diameter
- Size D - 1,000-4,000 miles in diameter
- Size E - 4,000-10,000 miles in diameter
- Size F - 10,000-40,000 miles in diameter
- Size G - 40,000-100,000 miles in diameter
- Size H - 100,000-1,000,000 miles in diameter
- Size I - 1,000,000-10,000,000 miles in diameter
- Size J - More than 10,000,000 miles in diameter
Shape classes give information about the general shape of the celestial body:
- Amorphous (flexible)
- Belt (smaller objects in a single orbit)
- Cluster (smaller objects in a small area)
Two special shape classes exist for planets that do not conform to one of the above shapes:
- Regular (a regular shape that isn't otherwise listed)
- Irregular (a shape that isn't listed)
Type classes give information about the substance which is most common on the celestial body:
- Air (also called a gas cloud)
- Earth (also called a world)
- Fire (also called a sun)
- Water (also called a water world)
Some sages add a fifth element:
- Plant (also called a liveworld)
Supplemental notes give additional information about a celestial body. Examples include, but are not limited to:
- Presence of and number of moons
- Lack of atmosphere
- Leathal atmosphere
- A hollow planet
- Large extradimensional gates
- Xenophobic natives (marked by an 'X')
- ↑ 1.0 1.1 1.2 Concordance of Arcane Space page 6
- ↑ Concordance of Arcane Space Celestial Body Classification sidebar, pages 34, 36, 38, 40 and 42
- Celestial Body Classification at Beyond the Moons (the official Spelljammer website)