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Could I ask a question about "Threshold", Ryk? In that, you have "plasma sail" spaceships, and talk about "tacking" against the solar wind and light pressure. This immediately raised a big question mark in my mind. Sailing ships can only tack because of the process of vector addition of the force exerted by the wind against the sail AND the force the sea exerts against the keel of the ship. No keel - no tacking. A spaceship does not have any equivalent of a keel, so I'm a little curious as to how this tacking process would work. I can't see how the propulsion could be anything other than directly outwards from the Sun!
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