Why living in space may require more than new technology

We see it in science fiction movies all the time:

humans settling on Mars or venturing into the far reaches of space. Though technology has certainly brought the fiction closer to becoming reality, one ongoing challenge stands in the way of conquering space: the human body.
The human body was built for life on Earth. Put us into space under microgravity and it reacts in unpleasant ways.
As they soar into space, many astronauts experience nausea and even vomiting — not exactly a stellar start. When they return, they can experience blurred vision, headaches, muscle atrophy, weak bones and possibly even lung cancer from galactic cosmic radiation — the equivalent of 10 chest X-rays a day.



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