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- Oral Histories List
- Orbital Dynamics
- Orbital Ring
- Orbits
- Order of Production
- Ore Bodies
- Oregon L5
- Orion (CEV)
- Orion (disambiguation)
- Osmium
- Out of the Box
- Ouyang Ziyuan
- Oxidizer
- Oxygen
- PDE, Pulse Detonation Engine
- PERMANENT
- Palladium
- PamHoffman.com
- Pam Hoffman
- Parsley
- Partial G Cost Estimates
- Partial G Experiments in the Past
- Partial G Health Experiment
- Partial G Launch Vehicles
- Partial G Space Station
- Partial G Todo
- Patrick Collins
- Paul Spudis
- People Carry
- People on Earth
- People on the Moon
- Periodic Table of the Elements
- Pete Worden
- Peter Diamandis
- Peter J. Schubert
- Peter Kokh
- Phil Stooke
- Phosphorus
- Picosatellite
- Plagioclase
- Platinum
- Platinum Group Metals
- Plutonium
- Polar Tower
- Polonium
- Potassium
- Power Beaming Demo
- Power Wires
- Power for Settlements
- Praseodymium
- Predicting Correctly Every Time
- Predicting the Future
- Progress in Remotely Operated Equipment
- Promethium
- Protactinium
- Proton
- Proton (disambiguation)
- Public Domain
- Purposes List
- Pyroxene
- Quonset Module Simulation
- Quotes
- R. E. Zee
- RECYCLING ROCKET EXHAUST
- Radiation Problem
- Radium
- Radon
- Railroads
- Ranger
- Rare Earth Elements
- Reactionless Thrust Station Keeping at L2
- Rectenna
- Recycling Rocket Exhaust Presented at Mare Cognitum Chapter Meeting
- Reduction
- Reflecting Telescopes
- Reflectivity
- RepRap
- Resource Values
- Return to Earth Science
- Reusable Rockets
- Review:Population Bomb
- Rhenium
- Rhodium
- Rille
- River Of Moon Rockets
- Roads
- Robert Paetz in Hollywood
- Robert S. Walker
- Robots in Space Suits
- Rocket Pioneers, Schemers and Dreamers!
- Rocket Team's Outcast!
- Rocketforge
- Roentgenium
- Roger Chaffee
- Roof Support
- Rubidium
- Ruthenium
- Rutherfordium
- Rutile
- Samarium