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Moonliner - interesting info, but a couple of comments -
The stars that are 4 light years away, to my knowledge, have no evidence of planets orbiting them. We are currently finding many planets around stars much farther away. This is why I started at 10 light years away.
We do not defy gravity in flight. Instead, we apply physics of create lift (Bernoulli, if I am spelling his name correctly) and can generate enough thrust to overcome the gravity of earth. In terms of curving space enough to travel to other areas of the galaxy faster, we are talking about gravitational forces millions of times more powerful than our sun, and I do not believe we will ever harness that type of energy.
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