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Let's assume that we can create a weapon that acts as a surface-to-orbit planetary defence weapon against an incoming object, like a giant meteor or an alien warship, with a range that extends past our own moon, maybe even further. And let's also assume we are able to scale it up to a 250 metre (830 feet, give or take) long structure without the sheer mass and size of it collapsing under the effects of gravity AND we have enough energy to provide a sufficient shot.
Which type of weapon commonly seem in science fiction, whether theoretically (or even practically) possible irl or entirely implausible? A rail gun? A particle beam? A photon torpedo? A giant gun that shoots out lightsabres?
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I always felt like directly firing antimatter is somewhat wasteful to begin with. You can forcefully kickstart a lot of reactions with just a tiny bit.