#Astronauts travelling to #Mars would encounter #radiation
levels higher than humans have ever experienced, and be exposed to them for much longer.
To protect them, the #spacecraft would either have to be much bulkier, making launches expensive and difficult, or be made of more efficient #shielding materials. https://www.skyatnightmagazine.com/space-missions/how-will-humans-survive-the-journey-to-mars
