One of the major roadblocks our culture has in regards to space travel is that in order to travel at speeds that could make a trip to a distant planet or star in a reasonable time frame is the application of energy: currently, we're stuck burning chemical fuel to propel our vehicles, of which means also lugging that fuel along with the vehicle, meaning the vehicle weighs more because of the extra fuel, meaning the vehicle has to carry more fuel to offset that weight -- it unfortunately becomes a cycle of inefficiency, making for a very slow vehicle.
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