A more challenging, yet vanilla feel to make space science more of a unique craft like the other introduced science packs. It helps integrate uranium mining into the tech path and gives uranium more utility I guess.

Making space science packs require uranium processing to discovered. I doubled the yield and made it only craft-able in a centrifuge.
10 Space Science Packs are made with:
1x non-enriched uranium
1x ice
1x carbon

Other than having to discover uranium technology, the real challenge is that you can only fit 20 uranium into a rocket, and that the centrifuge can only have 2 module slots. This is why I doubled the science pack yield from 5 to 10. Let me know if this is too harsh in the early to mid game. I'm testing it now.