If you use anti-mater for power, in a ship, for every ton of ship you need four(4) tons of water. The amount of anti-mater, needed depends on how energenic the reaction you need is. Omni Mag. some years ago run an article on this. You have was their example a one ton ship. To go to the moon, you would need four(4) tons of water to one 30 milligram capsal of anti-matter. To go to mars about ten times that. (journey takes one week) To go to Pluto in one month, 1 kilogram. So if you have a 1,000 ton ship, you will neeed fuel tanks able to store 4,000 tons of water. Roughly speaking, the volume would be 4,000 cubic meters. The amount of anti-matter would be very low.
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