Space Travel Linked to Heart Disease

Research indicated that the Apollo astronauts, who are the only humans to travel beyond the protective magnetic shielding of Earth, have an increased level of death from cardiovascular problems compared to astronauts who have never flown in space or who have only flown in Low Earth Orbit. The study looked at the 24 Apollo astronauts (including those who died of cancer and accidents) and compared them to 70 other astronauts, divided equally between unflown and LEO astronauts.
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