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        "thesis": "Flight-proven propulsion can send uncrewed spacecraft onto interstellar escape trajectories, but no demonstrated system closes acceleration, cruise survival, and destination deceleration for a crewed multigenerational vehicle. Fusion, antimatter, and externally beamed systems remain distinct concept families with unverified system-level assumptions.",
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          "Starshot proposes gram-scale laser-driven flyby probes and lists unresolved beam, sail, power, pointing, communications, and interstellar-medium challenges; it is not evidence for transporting a habitat."
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          "A rendezvous architecture must remove velocity relative to the destination. Carried propellant, external beams, stellar-photon assists, interaction with the interstellar medium, and predeployed infrastructure are separate proposed approaches; a flyby does not satisfy this requirement.",
          "High-speed interstellar-medium gas and dust, beam governance, energy cost, and drive maintainability remain architecture-limiting."
        ],
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          "Representative high-power nuclear-electric vehicles could improve deep-space science and Solar System logistics if integrated reactor, conversion, distribution, thruster, shielding, heat-rejection, and lifetime requirements close.",
          "Beamed-energy control, advanced materials, and plasma research have nearer applications in power, manufacturing, and communications."
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