this post was submitted on 10 Jul 2023
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Technology
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I don't know if it will happen in the next century, but we definitely should focus on moon and Mars colonies before thinking about leaving the solar system. I'm 48 and would love if we had a moon colony in my lifetime. At the very least some station where astronauts have an extended stay like they do on ISS.
Why does microgravity cause blindness?
I'm going off memory, but I'm pretty sure I read somewhere that the lack of gravity pushes all the blood in your body up to your head. On earth, your body has to fight gravity to get blood to your brain, so it evolved to squeeze blood out of your legs and lower body. In zero-g, the resistance is gone, but our bodies arent going to adapt so easily, so the blood is now being squeezed upward creating extra blood pressure in your head. I think i remember reading that some of that extra pressure concentrates right behind the eyes, which you can imagine is not great for them over time.