* Intergalactic: This describes something between galaxies.
* Extra-galactic: This describes something outside our galaxy.
* Pan-galactic: This describes something covering the entire galaxy.
* Astro-galactic: This combines "astro" (relating to stars) with "galactic."
You can also use prefixes like "pre-", "post-", "super-", "sub-", etc., to describe specific galactic phenomena, such as:
* Pre-galactic: Before the formation of galaxies.
* Post-galactic: After the existence of galaxies (perhaps in the far future).
* Super-galactic: Describing something larger than a typical galaxy, such as a galaxy cluster.
* Sub-galactic: Describing something smaller than a galaxy, such as a nebula or star cluster.
Let me know if you have a specific concept you're trying to describe, and I can help you find the appropriate prefix!