It’s estimated that Earth to Mars travelers, without proper shielding, would lose about 5 percent of their cells to slower cosmic rays during the voyage. Five percent, including skin cells, heart cells, and precious brain cells. If the sun throws a coronal mass ejection event at you when you’re among the planets, it ends quickly. Instead of just slowly raising your risk of generating a cancer, it gives you acute radiation poisoning, and within a few days or even hours your internal organs simply fall apart. First comes the nausea and vomiting. Then the diarrhea. Maybe just a bad stomach flu,
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