Living on the Moon or Mars....
+ The popular news likes to predict colonies on the Moon or Mars, but this is MUCH more difficult than tends to get conveyed on TV, etc.
+ These places have little gravity. Humans are well designed for EXACTLY the gravity on Earth. The long-term effects of much lower gravity simply aren't known but likely aren't good. Living there might be very temporary, in months not years and certainly not decades. And transporting people constantly would be very expensive (and likely dangerous).
+ These places are bombarded by radiation, extremely deadly to humans. Yes, living in lava tubes provides protection but it's still a very dangerous place... and it takes time to build those underground facilities. Because of radiation, extreme temp changes and a host of other (not nice) things, being on the surface would need to be very limited and with much protection.
Frankly, I've NEVER been much of a fan of humans living anywhere other than on good old Earth... or long travels in space. Or in the possibility of biological contamination of other places (and quite possibly here). It's all quite dangerous (and expensive). I'm a MUCH bigger supporter of robotic exploration and industry. It's much less romantic (and thus harder to fund) but (almost) eliminates the risks and is MUCH less expensive (meaning much more can be done for the same money). Develop robotics... Send them to the Moon and Mars (permanently - so no contamination of the Earth on return). Get over the ego-centrist thing of "Man on _______." Just get the job done, hopefully without killing people and potentially whole species, and for a WHOLE LOT less money.
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