unkn - Venu
- unknown particle
- unknown satellite
- unmanned
- unmanned launching
- unmanned satellite
- unmanned space rocket
- unmanned space vehicle
- unmanned spaceship
- unmanned suborbital launching
- unperturbed orbit
- unpowered phase
- unpredictable drift
- unpurified
- unrecoverable vehicle
- unrestricted-burning charge
- unrestricted-burning rocket
- unsafe fuel
- unscreened
- unseen face of the moon
- unseen side of the moon
- unshielded
- unshielded solar cell
- unstabilized
- unstable atmosphere
- unstable oscillation
- unstable particle
- unsymmetrical dimethylhydrazine
- unusable fuel
- up-time
- updraft
- upper air
- upper air research firing
- upper air temperature
- upper atmosphere
- upper boundary
- upper level
- upper stage
- upper transit
- upright position
- upright posture
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