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A gravity bubble was a form of technology that allowed an object to beat the boundaries of gravity and travel in space.
Edwin Bracewell applied this technology to Spitfires, allowing the pilots to travel around the orbit of planet Earth and attack the Dalek Saucer. Though this advanced technology was to be dismantled to avoid altering history, (TV: Victory of the Daleks) it was used again when the Eleventh Doctor summoned "Danny Boy" to Demons Run, where he destroyed the facility's communications array, then returned to his own time. (TV: A Good Man Goes to War)