Index - O

Oberth, Hermann, 4
     space station vision, 71
     space telescopes, 96

Observer, Mars, 117

Odyssey, Mars, 26-27, 121, 122f

Office of Space Science (OSS)
     missions of opportunity (MOs), 92
     robotic space explorers, 91

OMS (orbital maneuvering system), 59

Opportunity rover, 123-128, 124(f7.6)

Orbit
     Newton's theory of, 2
     space shuttles, 59-60

Orbital Astronomical Observatory, 96

Orbital maneuvering system (OMS), 59

Orbital Space Planes (OSPs), 69

Orbiters, 54-55, 55f, 57f, 58t, 63t, 68(f4.10)

Organizations
     American Institute of Aeronautics and Astronautics (AIAA), 50
     Artemis Society International (ASI), 51
     International Council of Scientific Unions (ICSU), 6 National Advisory Committee for Aeronautics (NACA), 3, 4
     Planetary Society, 50-51
     Verein für Raumschiffahrt (VfR), 4, 5, 50
     See also National Aeronautics and Space Administration (NASA); Rosaviakosmos

OSPs (Orbital Space Planes), 69

OSS (Office of Space Science)
     missions of opportunity (MOs), 92
     robotic space explorers, 91