Faster-than-light travel
From Tardis Wiki, the free Doctor Who reference
Faster-than-light travel is one of the most common methods of travelling long distances quickly, others including the Time Vortex., shared by most technologically advanced civilisations, as shown by the Nestene Conciousness' warp shunt technology (DW: Rose), the Krillitanes' knowledge of how to travel faster than light (DW: School Reunion), and the superluminal communications and travel technology used by the Butterfly People of the Arcateen system. (TW: Greeks Bearing Gifts, SJA: Invasion of the Bane)