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RE: "Houston, we have red rocks": Humanity and Mars
You forgot the first real problem with not even a theory as solution yet: Our bodies are not designed to perform space travels
So, we need to figure out a way to emulate real gravity, or tear each space explorer's eyes out to save their brains.
I was considering talking about centrifuges, as connection to this. However I plan on creating another article in a while about orbital physics, in which I'd mention centrifugal force and this concept of artificial gravity.