also, tip for making stuff that are going to be insanely hot...... BIZR can handle 9700+ temperature, tho only if it's already hot. you can use some bizr, then insl, then ttan to make a thing to confine a fusion reactor, for example.
make a damn fusion (or cold fusion, much eazier) reactor. NOW.
why in the world would you make a BALL of sand in zero gravity