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Is the Vision of a colony on Mars before the end of the decade possible?

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With the recent 150m hop of Starship prototype SN5, Elon's ambition (and our desire!) of colonizing Mars in the 2030s looks very real. If the development and testing were to continue at this pace, Starship should be ready for its maiden voyage before 2025. We'd be ready with the capability to launch humans, no doubt, but would we ready with the human systems? A round trip to Mars would roughly take about 21 months: about 18 months in deep space and 3 on Mars. Starship would probably be able to take us to Mars a little faster, possibly, in 6 months. But even that span could cause serious damage to the health of an astronaut if not protected from. So, what is this radiation that we're talking about? We're talking about ionizing or high-energy radiation. It includes X-rays, gamma rays, high energy protons, and cosmic radiation which on interaction with a surface would produce secondary radiation(alpha and beta particles) by knocking off electrons!                          

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