Discover magazine on
, with time to Alpha Centauri (4.4 ly) and
- Fission reactor: 46 years, .12c
- Fusion reactor: 46 years, .12c
- Antimatter reactor: 41 years, .66c
- Laser sail: 12.5 years, 1.0c
- Fusion ramjet: 25 years, 1.0c
Includes notes on how to keep people alive for the journey.