How much notice do you have to give? http://www.promenadedental.com/tutoring-help/ customised essay 10 dollars per page  The Van Allen radiation belts were first discovered by Explorers I and II. Shortly after their finding, it became clear to scientists that the belts represented some of the most hazardous environments a spacecraft can endure. When the radiation belts swell due to incoming space weather, they can surround spacecraft, exposing them to dangerous levels of radiation. With enough warning, however, spacecraft could be shielded from the worst effects.