http://news.nationalgeographic.com/news/2007/03/070323-space-shields.html
Scientists are very close to creating a new material that would shield astronauts from deep space radiation. The new material is a graphite nanofiber, and it is much later than the materials that are using to shield radiation here on earth. This nanofiber will be enriched with hydrogen, because when the large, high energy particles strike the shields particles are ejected and hydrogen is the lightest of all the elements, and therefore the least dangerous.
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