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> let’s say you use Falcon Heavy to deliver your kinetic weapon.

Why? pick up an NEO and aim for Sydney, or wherever it needs to go. Easy, unless your settlement isn't orbital or you don't have electric propulsion.

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(Roughly speaking) Kinetic weapon has as much energy as you spent getting it on orbit from surface, thus fuel in the rocket provides useful estimate and comparison point for energy available. To get from orbit to surface you actually need to slow down, ie reduce energy.

I'm saying you can pick up a large enough rock floating in solar orbit and nudge it to coincide with Earth using electric propulsion. Basically forcing a dinosaur wipeout event in a small scale. Sky's the limit for energy available.

But the problem is that for any rock large enough it will require a lot of energy and time, thus expensive and gives advanced warning.

What is a NEO?

Near-earth orbit

Thanks. :)

Near-Earth Object. Asteroids around Earth.

There is infinite supply of all sizes of boulders in space that you can just grab and turn into missiles given you have sufficient level of technology.

Thank you. Is there a sci-fi book where NEOs are used that you'd recommend? I'm not too versed in that genre.

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