radio
suspended animation
acceleration to and deceleration from relativistic speeds
star drives reaching near light speed without acceleration
faster than light, including quantum hyperdrive
instantaneous jumps, requiring time-consuming journeys between jumps
teleportation devices transported in slower than light ships
psychic teleportation between planetary surfaces
a T-machine
Motives
propaganda
racial survival
sharing the benefits of civilization
war and imperialism
trade in luxury items
trade in ideas and sciences
exploration
a new start on a new planet
interstellar travel as a way of life
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