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- Gravity Tractor
- Greens
- Gregory L. Matloff
- Hayabusa
- Heliogyro
- IKAROS
- International Symposium on Solar Sailing
- International Symposium on Space Technology and Science
- Interstellar Probe
- Jerome L. Wright
- Jonathan Vos Post
- K. Eric Drexler
- Kinetic Energy Impactor
- Konstantin Tsiolkovsky
- Large Space Structures Formed by Centrifugal Forces
- Larry Niven
- Letter to the Editors of New Scientist Re: Solar Sailing Breaks Laws of Physics
- LightSail
- LightSail Launch Countdown
- LightSail Readiness Tests Prepare Team for Mission Operations