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I expect there will a gravitic drive, one of these days. There might even be a space-time bubble warp drive. The main issue is it will still have to work with the law of conservation of energy. You have to add energy as you move out of the gravity well. The energy has to come from somewhere.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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