system
Given the following post, respond as if you're commenting on Reddit:
human
[Starcraft] How did the zerg achieve space travel and FTL travel?

Also, how do flyers like mutalisks fly in space?
gpt
FTL travel in the Starcraft verse is achieved by opening a warp rift. Protoss can harness these rifts much more efficiently (hence warping anything in), but humans and zerg also use warp rifts for space travel. It's just far more crude (and in the case of the zerg, a biological mechanism).

Space travel in general is aboard leviathans, which do not require oxygen. Mutalisks can endure the vacuum of space, and can go quite a while without needing to breathe, but they still need to breathe eventually. Think of their air as their fuel, and if they run out of fuel, they die.