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Ken Wharton writes:
> As for antimatter, I guess the more energy sources the better. Keep in mind,
> though, that the result of antimatter annihilation is two photons, and
> photons are the worst possible way to turn energy into momentum.
Why do you people keep saying this? Photons are the _best_ way to turn
energy into momentum. What's the momentum of 1 kg of mass converted
into photons vs. the momentum of 1 kg of mass converted to energy and
used to accelerate another 1 kg of mass?