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Only problem is, the fastest man made object in space has only achieved 3 percent of light speed. I have recently heard of the "Star Shot Intiative", and that made me think of something. If we can propel small space craft to a quarter of light speed or more using laser-based photonic propulsion, then if we could make more efficient and heat resistant sails, in addition to much more powerful lasers, could we not scale up and create what would essentially be interstellar-laser-powered-manned-spacecraft- highways? Can we, in theory, make better sails, better lasers, and then be able to push massive, manned craft through space at high percentages of light speed?
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