Heart hazard for Apollo astronauts: study

NASA's Apollo astronauts, the only humans to have travelled beyond Earth's protective magnetosphere, die disproportionately of heart and blood vessel diseases, researchers said Thursday, blaming radiation. This raises health concerns for all humans with dreams of travelling to the Moon, Mars or beyond, as space agencies and private companies vie to expand humankind's extraterrestrial footprint. "We know very little about the effects of deep space radiation on human health, particularly on the ca