An object's physical elements are the physical properties that do not vary with the passage of time.
The physical elements are as follows.
Name is the name, and has the symbol N. This is a text label used to identify the object and to distinguish it from other objects.
The name may contain any characters and be of any length.
Type is the type, and has the symbol T.
The type must either be Object or be in one of the categories Black Hole, Star, Planet, Moon, Asteroid, Meteoroid, Comet, Spacecraft, or Projectile.
Color is the color, and has the symbol C.
The color may have any RGB components, although it is recommended that at least one of the RGB components should have a value of 255 (the maximum possible) if the luminosity is non-zero.
Luminosity is the luminosity, and has the symbol L.
The luminosity must be a number greater than or equal to zero.
Mass is the mass, and has the symbol m.
The mass must be a number greater than or equal to zero.
Radius is the radius, and has the symbol r.
The radius must be a number greater than zero.
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