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Astronaut Safety Technical Issues Technical Challenges Optics Maintenance Testing Simulation Technology Data Transmission Propulsion System Problems Starliner Propulsion System Interstellar Travel Voyager 1 Docking Helium Leaks Propulsion Systems Thruster Systems SpaceX Dragon Splashdown Lunar Landing NASA's Commercial Crew Program Scientific Instruments Technical Difficulties Undocking Procedures Crew Safety Boeing Starliner Engineering Challenges Radiation Effects Testing Procedures