Subspace is a concept that appears in countless sci-fi works. It's also an important part of many sci-fi series' lore, Phantasy Star included. The predecessors of ARKS, the Photoners, liked to use it as a landfill for their failed Xion clones. One might think Star Trek is the first iteration of this notion. Well, it goes back even farther than that.
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Phantasy Star Online 2 (c) 2012 SEGA
Williamson, Jack - "Released Entropy", published August, 1937.