[arp242]

If it was that easy people would just do it, hm? Classic "HN commenter solves world problem after thinking about it for 5 seconds".

> insulting vacuum rendering the radiation harmless

Not even this is correct. Vacuum doesn't really "insulate" against radiation, at least not very effectively. It's the earth magnetic field and atmosphere that protects us. And even with that it's not harmless – surely you heard of "sunburn" and "skin cancer"?