[agent327]

Why would you dispose of such a useful material by attempting to shoot it into the sun? Sure, there is some danger associated with storing it, but it's not as if nuclear material is the only hazardous substance on the planet, and with the rest of it we seem perfectly ok with just sticking it in a hole somewhere. Nor does nuclear material, by itself, represent a danger of civilisation-ending proportions (only if you build a bomb out of it, and that is quite a significant operation that can only be conducted by people that know what they are doing. In other words, it won't explode if left by itself.).