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since gravity exists in mars if astronauts are able to land safely, how do they come back, how do they get launched back to space and from which launch pad?
If the astronauts have to stay for months on Mars the would require oxyge. So they need to grow plants to generte oxygen. So which plant? and how do they tap this oxygen?
Is it possible to gather volunteers of various ages n parts of the world to train them for specific tasks to be completed on mars?