The invisible problem with sending people to Mars
Briefly

Leaving Earth means not only leaving its gravity but also leaving its protective bubble, exposing astronauts to harmful space radiation that can impact their health.
The health risks from space radiation—while poorly understood—include increased cancer risk, effects on the central nervous system, and potentially worsening heart disease and cataracts.
Research on the International Space Station shows that microgravity causes issues such as vision problems and muscle loss, but space radiation presents its own, even greater challenges.
Read at The Verge
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