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It has been implied that Sidious built the death star in preparation for the Vong, so when exactly did he find out about them? Could he have prepared any better for a war with them?

Palpatine knew about the Vong before even the Clone Wars:

Thx.

So given he had THAT much notice, do you think he did an adequate job of preparing for them, or do you think he could have done more?

he could have told someone else lmao

Instead of wasting time/effort in helping to construct the Separatist faction as the Republic's enemy, Palpatine could have made the Vong his patsies instead. Granted it would have stalled his plans for several years, but in that time he could have allowed the Jedi Order to continue(so he would have thousands of Jedi to use as his proverbial 'meat shields' against the Vong), and could have also been continuously cloning troops and bolstering his numbers even further... Perhaps even petition to have multiple Death Stars constructed as well.

srug