I'm surprised nobody has yet mentioned Project Orion[1] which involved using atomic bombs to propel a spacecraft. Seems a little hare-brained to me, but they t

I'm surprised nobody has yet mentioned Project Orion[1] which involved using atomic bombs to propel a spacecraft. Seems a little hare-brained to me, but they took it pretty seriously back then. Of course, it was all just theoretical, which might be the reason nobody brought it up in this discussion. [1] http://en.wikipedia.org/wiki/Project_Orion_%28nuclear_propulsion%29 http://en.wikipedia.org/wiki/Project_Orion_%28nuclear_propul...