re: What is the deal with colonizing Mars?

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It's going to be costly and dangerous.

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Furthermore, it will probably take hundreds, if not thousands of years for an atmosphere to develop. And what gravity? Isn't gravity needed to hold the atmosphere on the planet?
Does Mars have enough for it to work?

And if one thing goes wrong on the way there, it's likely fatal.

The people doing this will need to be like the Gemini and Apollo folks.