ROCKET ENGINE SPECIFIC IMPULSE Solid fuel rocket 250 Liquid fuel rocket 450 Nuclear fission rocket 800 to 1,000 Ion engine 5,000 Plasma engine 1,000 to 30,000 Nuclear fusion rocket 2,500 to 200,000 Nuclear pulsed rocket 10,000 to 1 million Antimatter rocket 1 million to 10 million
