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Trivia Question

Physics of the Future: How Science Will Change Daily Life by 2100 by Michio Kaku

Which of the following is NOT a method of propulsion currently being explored or considered for future space travel?




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Solar Sails - using very large sails to capture the momentum of solar radiation Laser Propulsion - firing lasers at a spaceship from a fixed location (e.g., the moon) Spin Inertia - spinning an object around very fast on the surface of the Earth and releasing it when it reaches escape velocity Nuclear Reactor - using a nuclear engine (similar to a submarine engine) as propulsion rather than solid fuel rockets
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