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Link to Subject Category
object oriented programming - 61
observation of celestial bodies - 89
observation satellites - 18
observatories - 89
occultation (astronomy) - 89
ocean circulation - 48
ocean color (remote sensing) - 43
ocean currents - 48
ocean floor studies - 48
ocean wave studies - 48
oceanography - 48
offgassing/outgassing (composite materials) - 24
offgassing/outgassing (metallic materials) - 26
offgassing/outgassing (nonmetallic materials) - 27
Omega navigation system - 04
Omnidirectional Radio Range System (OMNI) - 04
onboard computer systems for aircraft - 06
onboard computer systems for spacecraft - 19
onboard instrument systems for spacecraft - 19
onboard sensors and recorders for spacecraft - 19
onboard solar arrays - 20
onboard solar generators - 20
operating systems (computers) - 61
operational effects of atmospheric variables - 08
operations research - 66
operator theory (mathematics) - 67
optical bistability - 74
optical coatings - 74
optical communication (space) - 17
optical communications (applications) - 32
optical communications (theory) - 74
optical fibers - 74
optical imaging devices (design and techniques) - 35
optical imaging devices (theory) - 74
optical materials - 74
optical measuring instruments (design and techniques) - 35
optical properties - 74
optical scanners (computer, peripheral equipment) - 60
optical telescope facilities - 89
optical telescopes - 89
optical tracking stations - 14
optical waveguides - 74
optics - 74
optimal control - 63
optimization (mathematics) - 66
opto-acoustic electronics - 33
optoelectronics (applications) - 33
optoelectronics (optics) - 74
orbit dynamics of spacecraft - 13
orbital maneuvers (control) - 17
orbital maneuvers (trajectories) - 13
orbital rendezvous - 13
orbiting maneuvering vehicles - 16
orbit-on-demand vehicles - 15
organic chemistry - 25
organometallic materials - 25
origin of life (extraterrestrial) - 55
origin of life (terrestrial) - 51
orography - 43
orotrons - 36
orthostatic tolerance - 52
oscillators - 33
oscilloscopes - 35
osmosis (biological) - 51
osmosis (chemistry) - 25
outer Earth radiation belts - 93
output devices (computers) - 60
overhaul facilities (aircraft) - 09
overhaul facilities (space) - 14
oxidizers - 28
oxygen generation - 52
oxygen systems (life support) - 54
ozone depletion (atmospheric physics) - 46
ozone depletion (pollution aspects) - 45
ozonesondes - 35
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