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years ago with apollo. a sprint to the moon and a photo opportunity, selfies, if you will as we call them today. the idea is to build an outpost and learn to you to live in space at some distance away. going to mars is a quantum leap beyond that. the distance is greater. the radiation exposure to the crew is greater. and we really don t know how to do it. we don t even know how to do the entry, descent, and landing for the amount of mass we need to get on the planet in a practical way. there s so many unanswered questions that need to be addressed, including whether we re going to go to mars on these traditional chemical rockets, or if we will build some more advanced propulsion, perhaps with a nuclear power plant, that will get us there much faster and allow the astronauts to be ier shape when they finally get to the surface of mars. the full interview with miles o brien a few hours from now.

Russians don tQuantum leapRadiation exposureNuclear power plantPier shapeMiles o brien