There was no shortage of threats facing Apollo astronauts on missions to the Moon. Like radiation. Specifically, the dense radiation environment of the Van Allen belts that surround our planet. When it launched Apollo missions through the Van Allen belts on a path to the Moon, NASA didn’t just hope for the best. The agency had studied the “Van Allen problem” as it were, knew the risks, and made the decision to go anyway. And not one astronaut died from passing through the Van Allen Belts.