I have to say, this is pretty titillating. It’s also the first I’m hearing about this sort of thing as a realistic possibility, and I wonder how seriously to take it. (The article says this rig can get to Alpha Centauri and back in a month. I assume that’s ship’s time, and so we’d still have to wait nine years or so to find out how it went.)
Awfully sexy mock-ups, though.
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In any situation that involves General Relativity, my advice is always bet on Big Al and give the points. He has never been proven wrong in almost a century.