obse - orbi
- observation satellite
- observational astronomy
- observational error
- observer's latitude
- observer's meridian
- observer's zenith
- obturation
- occultation
- occulting light
- ocean-going launching pad
- ocosphere
- octahedral satellite
- octant
- odor absorber
- oersted
- off-mixture ratio
- offensive missile
- offensive satellite
- offensive space system
- Office of Advanced Research and Technology
- Office of Aerospace Research
- Office of Applications
- Office of Manned Space Flight
- Office of Space Sciences
- Office of Tracking and Data Acquisition
- offset axis
- offset nozzle
- ogive
- OGO
- OLF
- Olymp
- omnidirectional antenna
- omnidirectional radio range
- on — off control system
- on-board guidance system
- on-board navigational system
- on-orbit stabilization
- oncoming particle
- one-body fix
- one-component accelerograph
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