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- O: 202 terms
- Oberon
- object oriented programming USE Computer Programming and Software
- observation of celestial bodies USE Astronomy
- observation satellites USE Spacecraft Design, Testing and Performance
- observatories USE Astronomy
- OCCASSIST USE Employee Assistance
- OCCHEALTH USE Occupational and Environmental Health
- OCCHYGIENE USE Industrial Hygiene
- OCCMED USE Occupational Medicine
- OCCPHYSICS USE Health Physics
- occultation (astronomy) USE Astronomy
- Occupational and Environmental Health
- Occupational Health
- Occupational Medicine
- Occupational Safety Program Office
- ocean circulation USE Oceanography
- ocean color (remote sensing) USE Earth Resources and Remote Sensing
- ocean currents USE Oceanography
- ocean floor studies USE Oceanography
- Ocean Surface Topography Mission
- ocean wave studies USE Oceanography
- Oceanographic Science
- Oceanography
- OCEANSCI USE Oceanographic Science
- OCIO USE Office of the Chief Information Officer
- ODEO USE Office of Diversity and Equal Opportunity
- OER USE Office of External Relations
- OFCO USE Office of the Chief Financial Officer
- offgassing/outgassing (composite materials) USE Composite Materials
- offgassing/outgassing (metallic materials) USE Metals and Metallic Materials
- offgassing/outgassing (nonmetallic materials) USE Nonmetallic Materials
- Office
- Office of Center Operations
- Office of Chief Counsel (GSFC)
- Office of Chief Counsel (SSC)
- Office of Communication
- Office of Communications & Public Affairs
- Office of Communications and Education
- Office of Communications Planning
- Office of Diversity and Equal Opportunity
- Office of Diversity and Equal Opportunity (KSC)
- Office of Diversity and Equal Opportunity (MSFC)
- Office of Diversity and Equal Opportunity (SSC)
- Office of Education
- Office of Equal Opportunity Programs (GRC)
- Office of Equal Opportunity Programs (GSFC)
- Office of Export Compliance
- Office of External Affairs and Education
- Office of External Relations
- Office of Health and Medical Systems
- Office of Human Capital (MSFC)
- Office of Human Capital (SSC)
- Office of Human Capital Management
- Office of Human Capital Management (GSFC)
- Office of Infrastructure and Administration
- Office of Inspector General
- Office of Inspector General (KSC)
- Office of Legislative Affairs
- Office of Mission Integration
- Office of Mission Success
- Office of Procurement
- Office of Procurement (JSC)
- Office of Procurement (MSFC)
- Office of Program Analysis and Evaluation
- Office of Protective Services
- Office of Public Affairs (GSFC)
- Office of Research
- Office of Safety and Mission Assurance
- Office of Safety and Mission Assurance (SSC)
- Office of Safety and Mission Success
- Office of Science Planning
- Office of Security and Program Protection
- Office of Small and Disadvantaged Business Utilization
- Office of Strategic Analysis and Communications
- Office of Strategic Management
- Office of Systems Safety and Mission Assurance
- Office of the Administrator
- Office of the Associate Director (GSFC)
- Office of the Chief Counsel (ARC)
- Office of the Chief Counsel (GRC)
- Office of the Chief Counsel (JSC)
- Office of the Chief Counsel (KSC)
- Office of the Chief Counsel (MSFC)
- Office of the Chief Engineer
- Office of the Chief Engineer (ARC)
- Office of the Chief Engineer (JSC)
- Office of the Chief Engineer (KSC)
- Office of the Chief Financial Officer
- Office of the Chief Information Officer
- Office of the Chief Information Officer (GRC)
- Office of the Chief Information Officer (MSFC)
- Office of the Chief Scientist
- Office of the Chief Technologist
- Office of the Director (ARC)
- Office of the Director (DFRC)
- Office of the Director (GRC)
- Office of the Director (GSFC)
- Office of the Director (JPL)
- Office of the Director (JSC)
- Office of the Director (KSC)
- Office of the Director (LARC)
- Office of the Director (MSFC)
- Office of the Director (NESC)
- Office of the Director (SSC)
- Office of the Director (STSI)
- Office of the Director of Project Management and Engineering Directorate
- Office of the Director of Science
- Office of the Executive Director
- Office of the General Counsel
- Office of the Inspector General
- Office of the Management System
- Official Reports
- Officials
- Ofice of Equal Opportunity and Diversity (JSC)
- OIG USE Office of Inspector General
- Omega navigation system USE Aircraft Communications and Navigation
- Omnidirectional Radio Range System (OMNI) USE Aircraft Communications and Navigation
- onboard computer systems for aircraft USE Avionics and Aircraft Instrumentation
- onboard computer systems for spacecraft USE Spacecraft Instrumentation and Astrionics
- onboard instrument systems for spacecraft USE Spacecraft Instrumentation and Astrionics
- onboard sensors and recorders for spacecraft USE Spacecraft Instrumentation and Astrionics
- onboard solar arrays USE Spacecraft Propulsion and Power
- onboard solar generators USE Spacecraft Propulsion and Power
- Online Help USE Help Files
- operating systems (computers) USE Computer Programming and Software
- operational effects of atmospheric variables USE Aircraft Stability and Control
- Operational Interface Agreements USE Agreements
- Operational Precursor and Technology Demonstration
- Operations
- Operations
- Operations and Data Management
- operations research USE Systems Analysis and Operations Research
- operator theory (mathematics) USE Theoretical Mathematics
- Ophelia
- Optical and Infrared Astronomy
- optical bistability USE Optics
- optical coatings USE Optics
- optical communication (space) USE Space Communications, Spacecraft Communications, Command and Tracking
- optical communications (applications) USE Communications and Radar
- optical communications (theory) USE Optics
- optical fibers USE Optics
- optical imaging devices (design and techniques) USE Instrumentation and Photography
- optical imaging devices (theory) USE Optics
- optical materials USE Optics
- optical measuring instruments (design and techniques) USE Instrumentation and Photography
- optical properties USE Optics
- optical scanners (computer, peripheral equipment) USE Computer Operations and Hardware
- Optical Spectrographs
- Optical Systems
- optical telescope facilities USE Astronomy
- optical telescopes USE Astronomy
- Optical Telescopes
- optical tracking stations USE Ground Support Systems and Facilities (Space)
- optical waveguides USE Optics
- Optics
- optimization (mathematics) USE Systems Analysis and Operations Research
- opto-acoustic electronics USE Electronics and Electrical Engineering
- optoelectronics (applications) USE Electronics and Electrical Engineering
- optoelectronics (optics) USE Optics
- OPTSYS USE Optical Systems
- or are affected by design, development, testing, USE Aircraft Design, Testing and Performance
- Orbit determination
- orbit dynamics of spacecraft USE Astrodynamics
- orbit-on-demand vehicles USE Launch Vehicles and Launch Operations
- orbital maneuvers (control) USE Space Communications, Spacecraft Communications, Command and Tracking
- orbital maneuvers (trajectories) USE Astrodynamics
- orbital rendezvous USE Astrodynamics
- Orbital Sciences
- Orbiting Carbon Observatory Mission
- orbiting maneuvering vehicles USE Space Transportation and Safety
- OrbView-2
- ORFEUS-SPAS I
- ORFEUS-SPAS II
- organic chemistry USE Inorganic, Organic and Physical Chemistry
- Organizational Science Fundamental Research
- Organizational Structure
- Organizations
- organometallic materials USE Inorganic, Organic and Physical Chemistry
- origin of life (extraterrestrial) USE Exobiology
- origin of life (terrestrial) USE Life Sciences (General)
- Orion Crew Vehicle
- orography USE Earth Resources and Remote Sensing
- orotrons USE Lasers and Masers
- orthostatic tolerance USE Aerospace Medicine
- oscillators USE Electronics and Electrical Engineering
- oscilloscopes USE Instrumentation and Photography
- OSDBU USE Office of Small and Disadvantaged Business Utilization
- osmosis (biological) USE Life Sciences (General)
- osmosis (chemistry) USE Inorganic, Organic and Physical Chemistry
- OSPP USE Office of Security and Program Protection
- Other associated launch services
- Other NASA Partners
- outer Earth radiation belts USE Space Radiation
- output devices (computers) USE Computer Operations and Hardware
- overhaul facilities (aircraft) USE Research and Support Facilities (Air)
- overhaul facilities (space) USE Ground Support Systems and Facilities (Space)
- oxidizers USE Propellants and Fuels
- oxygen generation USE Aerospace Medicine
- oxygen systems (life support) USE Man/System Technology and Life Support
- ozone depletion (atmospheric physics) USE Geophysics