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From who does the power grid in space need protection from? Aliens who like to bully lesser races around?

I don't see anyone attacking such a power grid. Those capable of doing so could just sent some collectors up themselves and call it a day. The outcome of shooting down such a device would be undesirable for both sides. One loses its power and the other will be frowned upon my the rest of earth.

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Is space terrorism a realistic prospect at some time in the future? I honestly feel like a dirty tabloid headline writer for asking, but do you think it's a viable future probability?

If, by space terrorism, you mean that some crazy group tries to shoot down a power grid in space, no. I don't think so. There won't be a 'terror' aspect to it. It's unlikely that 100% of the power will come from this or there to be a major power downtime as a result. So people will just go: "Meh, what are they shooting satellites down for?" They'll be unaffected by it and that's not what terrorism is.

I wonder how hard it is to shoot a rocket into space and hit something up there.

We might have our share of space pirates though – if we don't blow ourselves back to the Stone Age. Me be one of em, Arrr!

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