Scientists have discovered that zero gravity can adversely affect the bones of even the healthiest astronauts.


This article by Jocelyn Solis-Moreira, writing for Popular Science, makes the following points:
  • A recent study in Scientific Reports found that spending just a few months in space changes astronauts’ bones.
  • The loss of bone density is equivalent to what most humans would lose in a couple of decades on Earth.
  • More concerning is that even after a year many astronauts have still not recovered their lost bone mass.
  • An earlier study, published in 2020, simulated the impact of a three-year spaceflight to Mars, finding a 33 per cent risk of osteoporosis for long-distance travellers.


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