Marc Millis gives an update on the Tau Zero Foundation, which is a group working towards “practical interstellar flight”: Status Report on the Tau Zero Foundation – Centauri Dreams.
One of their efforts is Project Icarus, which is a follow-on to the famous Project Daedalus study in the 1970s.
Here are some related resources: /– Faces from Earth! /– Faces from Earth! – introduction /– The PI Club – Peregrinus Interstellar /– The PI Club | Facebook