I forgot to add, all the astronauts in I.S.S. that have been deployed more than a few months start experiencing permanent brain damage. Within 3 to 5 months, t

I forgot to add, all the astronauts in I.S.S. that have been deployed more than a few months start experiencing permanent brain damage. Within 3 to 5 months, they have to start taking medication from glaucoma. Their brain starts expanding and puts pressure on the optic nerves. The condition is called SANS [1]. That bad part is, this condition does not get better when they return to earth. To get to mars will take about 220 days. Unless we find a way to prevent the brain damage, anyone going there will be blind before they ever land. [1] - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7005826/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7005826/