- Race for Space 1: Dawn of the Space Age
- Race to Space
- Real Space
- Real Time
- Reality Is Not What It Seems
- Rebel Star
- Reconstruction of the Planetary Soul
- Recreations in Astronomy - With Directions for Practical Experiments and Telescopic Work
- Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work
- Reflections on the Astronomy of Glasgow
- Reinventing the Universe
- Reise in die Unendlichkeit
- Reiseziel Sternenhimmel
- Rejsen ud af kaninens pels
- Relatively Spacious: Space and Time and our Place Within It
- Rendezvous mit dem Universum
- Report Series
- Report Series: Committee on Astrobiology and Planetary Science
- Report Series: Committee on Astronomy and Astrophysics: Small Explorer Missions
- Research On "The Creation and End of the Universe"
- Resilient Space Systems Design
- Resistencia
- Respostas de um astrofísico
- Return to Earth
- Review and Assessment of Planetary Protection Policy Development Processes
- Riccioli d'oro e gli orsetti d'acqua
- Riscrivere la genesi
- Robert Koch
- Robots In Space
- Rocket Billionaires
- Rocket Men
- Rockets and People, Volume I - Memoirs of Russian Space Pioneer Boris Chertok, Early Years Through W...
- Rockets and People, Volume II: Creating a Rocket Industry - Memoirs of Russian Space Pioneer Boris C...
- Rockets and People, Volume III: Hot Days of the Cold War - Memoirs of Russian Space Pioneer Boris Ch...
- Rockets Are Meant To Soar
- Rocks from Space
- Romancing The Moon
- Rosetta Stone of Astronomy
- Rotation of Planets & Inertia
- Roter Mond
- Rotácia planét a zotrvačnosť
- Ruimtevaart in Europa
- Ruimtevaart in Nederland
- Rutherford and Fry’s Complete Guide to Absolutely Everything (Abridged)
- Rätselhafte Phänomene - Band 1