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The Bussard ramjet could only get to a fraction of the speed it would take for interstellar travel. I would also suggest missions with actual humans to be out of the question. In my humble opinion the future of space is in robotics.
Could it be that the way to slow down before arriving at a destination Solar_System is to use Solar_Sails to Reflect Light coming from The Destination Solar_System for a Longtime before entering into The Destination Solar_System?