I know it's not a new idea but it seems like the time has probably come for there to be a YC Space, YC SaaS, YC Edu, etc.

YC should seriously consider going one level of abstraction up. Instead of YC being an investment firm that creates startups, it should be an investment firm that creates investment firms.

A space-focused YC could probably be a lot better than a generic YC. It would undoubtedly source and fund more than 5 space startups in a 375 company batch, for example.