In a galaxy far, far away. My guess is that there are other civilizations out there, but they're suffering from the exact same problems as us - long distances,

In a galaxy far, far away. My guess is that there are other civilizations out there, but they're suffering from the exact same problems as us - long distances, huge energy requirements, lots of time. If we can't get out to the stars, I can see why plenty of civilizations would be having trouble.