If I'm correct nuclear fusion rockets, (if used the right way), can go up to 10% the speed of light. THis is while nuclear fission goes 5% the speed of light. Yet NASA is working on craft that can make a "Earth-Mars-one way in two months". This is better then our current six month. Yet if I'm right, light takes about 10 min to get to Mars. So a craft (nuclear fussion) could go to mars at 10% the speed of light in 100min or 200min including deacelearation time. 200min is 3.3 hours. So whats this 2 month crap?:surprised ps: Nuclear Fission: acceleration:10*20=200 min. deacceleration is 400min or 6.6 hours.