Interstellar travel
The Physics of Interstellar Travel
Spacecraft propulsion
Ion thruster
Solar Sail Navigation Technology of IKAROS
Bussard ramjet
Beam-powered propulsion
Warp Field Mechanics 101 (White) (PDF)
100 Year Starship
Project Daedalus
Project Icarus
Project Orion
Project Longshot
Project Valkyrie
Wait Calculation
The Fermi Paradox and Project Daedalus