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Time as we know it--the fourth dimension--much like space, is a physical thing. It's just another dimension helping to shape the universe, and like all things, is subject to relativity, and even reacts to gravitational forces. As with the first three dimensions, it can be viewed, observed, poked and prodded, even traveled and reshaped. Like any mode of transportation, travel in the fourth dimension can be accomplished by a variety of means as well. One of the first attempted methods of travel came a few cycles after some breakthroughs in gravitational research, namely in the generation of gravitational fields, and secondarily in the acheival of antigravitational effects.
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