There are still some substantial issues that need to be dealt with. It is not simply engineering science technologies that we already have seen in the lab, but developing new capabilities. One big issue: Solar radiation and sunspot flares. How do you keep people from dying from exposure on the moon? On Mars? On the trip to Mars? We were lucky with the moon missions to land through a significant solar lull. (The Sun is really boring right now too.)
We are working the problems as best we can without national political focus (and dollars) being devoted to the task. NASA has been a funding afterthought for three decades. The private programs are starting, but slowly.
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We are working the problems as best we can without national political focus (and dollars) being devoted to the task. NASA has been a funding afterthought for three decades. The private programs are starting, but slowly.