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Comment Re:requires 18000kg of antimatter (Score 1) 392

Certainly, but given that there's no magic way of turning ordinary matter into antimatter, the only way of getting that 18 tonnes of antimatter is to make the stuff --- which is where the 4e21 joules of energy comes in.

And frankly, if I wanted to devastate a planet and had 18 tonnes of antimatter around, it would be far more convenient just to take the lid off the bottle than to do all that fiddly messing around with space travel.

(Right now state of the art is just about at the stage of producing one fundamental particle of antimatter at a time. I recall a few years ago that someone had actually managed to assemble a single anti-hydrogen atom that was stable for a while, until they dropped it.)

"Love your country but never trust its government." -- from a hand-painted road sign in central Pennsylvania