the idea for an Antimatter catalyst engine is probably my favorite idea of any propulsion that can be easily attained by a type I civilization. We're a type 0.78 civilization and to build an antimatter beam core engine (an antimatter engine that has a 1:1 matter/antimatter anhialation drive) would require something like 10 micrograms (1,000,000 times more antimatter than is produced annually at both Fermilab and CERN) to achieve interplanetary travel let alone interstellar. An antimatter catalyst engine uses a tiny fraction of that to ignite a fusion/fission reaction to provide propulsion. 140 nanograms (1 microgram = 1000 nanogram) of antimatter (14 times the annual antimatter production now and 1.4 times the production after the modifications to fermilab) would enable an a 30 day trip to Mars including the return trip home (not including the amount of time to stay on the planet). Like I said before, todays annual production of antimatter is around 10 nanograms of antimatter. After the new installments to fermilab that should be increased by a factor of 10-100. This modification could allow the first antimatter catalysed microfusion engine to be created in the near future, possibly even by 2050. AIMstar (Antimatter ignited microfusion) is a design for an antimatter catalyst engine. ICAN II is another... Anyone who has seen the discovery special "Alien Planet" would know that the fictional planet Darwin IV is 6.5 Light years away. The space probe "Von Braun" travels at 37.6 thousand miles per second (around 20% the speed of light) and takes 42 years to reach Darwin IV (traveling at 20% the speed of light from the departure from eath would mean that the Von Braun would take 32 years to reach Darwin IV however 10 years is required for acceleration). The Von Braun spacecraft is powered by an ion drive to attain solar escape velocity and an antimatter catalyst enging to attain 20% light speed. Again I suggest to ANYONE who has not seen the discovery special "Alien Planet" to watch it. The link above & below is to the full documantary. It pretty much single handedly created my passion for science. Watch it!