Possible Clues:

• Dists. between stars
• Voyages of the ''USS Enterprise''
• Distance units in astron
• Intergalactic distances (Abbr.)
• Galactic distances: Abbr
• Intergalactic distances: Abbr
• Parsec's 3.26, roughly: Abbr
• Astronomical distances: Abbr
• Dist. between stars
• Interstellar dists.