Comment Re:Effect of nukes on NEOs (Score 1) 272
> I'm pretty confident that absorbing half of the energy output of a significantly sized fusion explosive
How do you propose to do that?
In space, the primary effect of the bomb over any sort of range, like a kilometer, is x-rays. These rapidly heat nearby objects and cause shock waves. The energy transfer is not particularly efficient.
They work great against RV's because the shock wave can cause the heat shield to detach from the underlying aerostructure. Against something like an asteroid I suspect it would damp out rather rapidly.
So that leaves offgassing from the outermost layer of the asteroid. That might be what, 0.1% efficient?
Take a liquid sodium reactor, connect it to an electrical heater that scoops up and melts the asteroid material. Allow that to radiatively cool (and even regenerate the heat) and then fire that out of a mass driver. The total delta-v-per-pound-of-fissile is going to be at least one order of magnitude better.