Astronautics Vocabulary

The Astronautics Vocabulary is a glossary of terms that pertain to the science and technology of spaceflight. This alphabetical list can be navigated by clicking on the letters A-Z displayed on this page.

• observation window
• Observations of Electric-field Distributions in the Ionosphere Plasma - a Unique Strategy (OEDIPUS-C)
• oil spill
• on-board equipment
• Optical Spectrograph and Infra-Red Imaging System (OSIRIS)
• orbit
• orbit lowering
• orbit raising
• orbit replaceable unit (ORU)
• orbital control
• orbital flight test
• orbital manœuvre
• orbital station
• orbiter
• orbiting
• ordinary matter
• ORU temporary platform (OTP)
• ORU tool changeout mechanism (OTCM)
• Osteoporosis Experiments in Orbit (OSTEO)
• outer space