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Crystal spheres are also known as crystal shells.<ref name="CoAS">[[AD%26D_Adventures_in_Space#Concordance_of_Arcane_Space|''Concordance of Arcane Space'']] pages 9-10</ref>

Only a few methods are known to allow travel from one side of a crystal sphere to the other side.<ref name="CoAS">[[AD%26D_Adventures_in_Space#Concordance_of_Arcane_Space|''Concordance of Arcane Space'']] pages 9-10</ref>

These spells (or magical devices that duplicate them) allow spellcasters to jump from one side of the sphere to the other without physically crossing the sphere.

This spell (or a magical item that duplicates it) makes part of the crystal sphere immaterial and allows a [[spelljamming ship]] to pass through.

Most crystal spheres have natural portals that pierce the shell at various locations. These portals usually and vanish at random times and are located in random places. Looking for these portals can take a long time.

In some crystal spheres, stars are located on the inside of the crystal shell. A few of these stars are themselves also natural portals through the crystal sphere. A spelljamming ship diving into the heart of the star would pass through the shell and appear in the phlogiston. However, a high number of stars are portals to the [[Plane of Radiance]] or the [[Plane of Fire]]. Flying a ship into one of those stars would be fatal.

The legendary ship, called ''The Spelljammer'', and some large space creatures, like space dragons, seem to have an innate ability to create portals similar to the natural portals. These portals close slowly over time, so ships can sometimes use them.

This spell duplicates the natural ability of ''The Spelljammer'' and space dragons, but the portals created by this spell have a much shorter duration. Portals created via this spell last no longer than 120 minutes.

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 astronomicals]] rather than true planets.<ref name="SJR6">[[SJR6 Greyspace|''SJR6 Greyspace'']] page 3</ref>

It is possible for a crystal sphere to contain another crystal sphere, or a series of smaller and smaller crystal spheres.<ref>[[AD%26D_Adventures_in_Space#Concordance_of_Arcane_Space|''Concordance of Arcane Space'']] Nonstandard Systems sidebar pages 68, 70 and 72</ref>

* [http://www.spelljammer.org/worlds/#h_CrystalSpheres Crystal Spheres at '''''Beyond the Moons'''''] (the '''official''' ''Spelljammer'' website)

* [http://www.spelljammer.org/worlds/articles/SphereGuide/Guide%20to%20the%20Spheres.pdf ''An "official" Spelljammer Guide to the Spheres'' by Paul Westermeyer at '''''Beyond the Moons'''''] (the '''official''' ''Spelljammer'' website)