Here's how space alters the human body

Space is a dangerous and unfriendly place not suited for human life, yet astronauts are sent up to the International Space Station every year.
From exposure to high levels of radiation to surviving in micro-gravity conditions, space can be a tough place to live.Without gravity working on your body, your bones and muscles start to break down. Bone density drops by over 1% per month.
On Earth, gravity compresses our spinal cords. But in space, the microgravity environment stretches the spine and