As a kid, the first time I heard of space totally blew my mind and fascinated me, and growing up I always had this dream about living/being in space. When I grew older in pursuit of that dream I had to research about it and gain some knowledge. After hours of research including articles, videos and studies, I decided I am very happy with my place right here on mother earth, I think you would agree with me if you keep on reading.
Gravity on earth stabilizes loads of bodily functions, and since space is a state of no gravity (weightlessness) –like swimming in a pool – the body can’t perform in the same manner.
Astronauts experience a lot of conditions, which are much less common on earth. The main culprit for those would be weightlessness. These conditions include:
- Space adaptation syndrome: a condition experienced by around half of space travelers during adaptation to weightlessness. It is related to motion sickness, as the vestibular system adapts to weightlessness.
- Spinal expansion due to absence of gravity’s pulling force.
- Osteoporosis: decrease in bone mass and density due to lack of gravity/stress.
- Muscle Atrophy: a decrease in the mass of the muscle, due to not exerting much effort in a null gravity environment.
- Puffy faces/bird legs: due to even distribution of bodily fluids caused by null gravity/pull force.
- Blood atrophy (up to 22% loss of blood volume)
The video by Michael Stevens explains more and give more details and interesting links.