system
Given the following post, respond as if you're commenting on Reddit:
human
[DUNE] If interstellar travel without spice is impossible, then how did they find/get to Arrakis in the first place?

Arrakis is clearly not where humans came from. In fact, I think in this universe they came from Earth.
gpt
Advanced artificial intelligence computers and blind luck navigating FTL. Spice doesn't create FTL it just makes it safer without the aid of thinking machines. Before the discovery of the prescience spice grants (ability to see the future) machines calculated the safest route based on billions if not trillions of variables or humans just YOLO'd it into the void and sometimes managed to not die in the process.