Bubble (galactography)
The extent to which a starfaring civilization has expanded through interstellar space. Specifically used to refer to those civilizations that colonize and terraform worlds, mine asteroids, planets, and stars, build megastructures, and generally exploit resources and make a big environmental impact wherever they go, like the Terragens (hence - the "Terragen Bubble"), rather than nomads like Meistersingers.
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Development Notes
Text by M. Alan Kazlev
Initially published on 08 October 2001.