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The thing your're missing is that the Hohmann Transfer orbit takes time, and both Mars and Earth are moving around the sun. For the Hohmann Transfer orbit to work, the position of Mars at arrival has to be opposite the point of of Earth at Departure. The following image depicts Earth's and Mars' orbit as circular, rather than elliptical to simplify ...


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Much of engineering is about compromises. One can find an ideal solution, like a Hohmann transfer orbit. Yes, that is the most fuel efficient way to get from earth orbit to Mars orbit. It is like the top of a rounded mountain. That is the peak, but there is a lot of ground near the peak that is almost as high. Maybe you are willing to give up a bit of ...


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Quite possibly Upon learning that Mars did have surface water at some point, you have updated your question to ask if Mars would be a good approximation for Earth if Earth had little to no water, or if the water had been missing for a period of time. Conversely, try looking at areas of the Earth that have had little to no water, or where the water has been ...


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