<div dir="ltr">"Gravity. It's not just the law, it's a good idea."</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jul 2, 2022 at 9:44 AM BillK via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><<a href="https://www.extremetech.com/extreme/337611-astronauts-suffer-significant-permanent-bone-density-loss-in-space" rel="noreferrer" target="_blank">https://www.extremetech.com/extreme/337611-astronauts-suffer-significant-permanent-bone-density-loss-in-space</a>><br>
By Ryan Whitwam on July 1, 2022<br>
<br>
Quotes:<br>
Even after a year back on Earth, bone density does not fully recover.<br>
Essentially, being in space for even a few months causes your bones to<br>
age at an increased rate — as much as 10 years per flight.<br>
Astronauts who were on the International Space Station for longer than<br>
six months recovered less of their bone density after returning. That<br>
suggests that long-term missions, like the ones planned for the<br>
Artemis Program, could have serious impacts on astronaut health down<br>
the road. It also raises more questions about how humans would fare<br>
long-term in an environment where there is less gravity than Earth,<br>
for example on the Moon or Mars.<br>
--------------------<br>
<br>
Astronauts do exercise while on the ISS, to help prevent muscle wastage.<br>
But 2 hours of exercise per day means that the other 22 hours are the<br>
equivalent of lying in bed. I think long-term missions over six months<br>
duration will have to have a rotating section that provides an earth<br>
gravity environment using centrifugal force.<br>
<br>
BillK<br>
<br>
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</blockquote></div>