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It appears that the folks at the ALIEN RPG have latched on to the “Middle Heavens” prop famous from a behind-the-scenes set photo from the map table in the aft section of Nostromo’s bridge.
The “Middle Heavens” text came from a 1970s-era Philip’s Chart of The Stars and is presumed to have been used for its technical appearance rather than any pertinence to the Alien universe.
At any rate, here is a glimpse of the map:
You can read a fascinating article about the origins of the “Middle Heavens” map at Alien Explorations’ Alien: The “Middle Heavens”
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