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There is an idea called the bussard warp drive, which accelerates and uses the time dilation factor to get a crew very far in a limited time.
Another deisgn is a bussard ram scoop, which is a space craft that uses a very strong magentic field that extends for miles to collect the trace ammounts of interstellar hydrogen that exist between stars.
From the ion engines that are already working to explore the Solar System to the prototype solar sails to futuristic technologies like magnetic sails, and bussard ramjets.