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The size of crystal spheres is usually determined by the size of the planetary system within them. Each sphere usually is usually twice the diameter as the outermost planet within the crystal sphere, but spheres can be larger than this.<ref name="CoAS">[[AD%26D_Adventures_in_Space#Concordance_of_Arcane_Space|''Concordance of Arcane Space'']] pages 9-10</ref> There are often astronomical objects that defy this 'double diameter' rule and orbit outside the outermost [[planet]]. Sages who support the 'double diameter' rule usually argue that these [[celestial body|celestial bodies]] are [[additional astronomical|additional astronomicals]] rather than true planets.<ref name="SJR6">[[SJR6 Greyspace|''SJR6 Greyspace'']] page 3</ref>