- "Look, this whole junkball's held together by a tractor envelope. Stops it from breaking apart."
- ―Chelli Aphra
A tractor envelope was a form of gravity field. The wrecked ships that made up the body of the Galactic Empire prison Accresker Jail were held together with a tractor envelope.[1]
Appearances
- Doctor Aphra (2016) 23 (First mentioned)