Local Bubble
"Low density" plasma region of space left by former supernova some tens of millions of year ago. Approximately equivalent to the Inner Sphere.
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    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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    The arm of the Milky Way Galaxy where most of Terragen civilization is still located, and which includes the Sol System. It is also called the Orion Arm.
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Development Notes
Text by M. Alan Kazlev

Initially published on 03 December 2001.