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Message: <blockquote data-quote="Dungeonosophy" data-source="post: 6358689" data-attributes="member: 6688049">Thanks for the response steeldragons. This is how I remember it:In the 1e MotP, the AD&D worlds were implied to be different planets in different solar systems somewhere in the black void of the Prime Material Plane. There was no spelljammer or crystal spheres. Just "outer space". There was a detailed chart about Alternate Prime Material Planes, but I forget if and how it was supposed to be related to the various D&D worlds.This may be only fully relevant to Mentzer's home campaign, but Frank Mentzer even said (<a href="http://www.dragonsfoot.org/forums/viewtopic.php?p=173232&sid=5a117642625c0278d44b69039bb54bc2#p173232" target="_blank">here)</a> that his home version of Oerth is in the real world Tau Ceti solar system. In his BECMI boxed sets, he says that Mystara (known as "Urt" in the BECMI boxed set era) is supposed to be the Jurassic past of Earth--in other words, that "Urt"/Mystara is actually Earth.In 2e: As you say, all the crystal spheres of the 2E worlds are located in the Material Plane, with a shared Great Wheel cosmology. Canonically, the BECMI version of Mystara exists in a completely different Reality (this is described in the DRAGON magazine article "<a href="http://www.pandius.com/upaway.html" target="_blank">Up, Away, and Beyond" </a>). However, the 2e version of Mystara is part of the Great Wheel cosmology and has spelljammers (one crashed there in the First Quest boxed set).In 3e: No more crystal spheres. (Did 3e say what's at the edge of the solar system of those campaign settings?) Each D&D world is a Prime Plane to itself, with its own cosmology. Those cosmologies are connected only by the Plane of Shadow.In 4e: I didn't follow 4e much, but it seems to me that the "Astral Sea" was a merger of the Astral Plane (of Planescape) and Wild Space (of Spelljammer), with each Outer Plane being a discrete planet which could be visited by an astral ship. I don't know where the planets and solar systems of Nerath, Toril, and Athas were supposed to be relative to each other.Am I remembering correctly?So I wonder which aspects of these four iterations of "outer space" will find their way into 5e.</blockquote>

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