Could there be a civilisation more advanced than Earth's?
If we make contact they’re guaranteed to be more advanced than us. If they’re less advanced they won’t have the technology to communicate across interstellar distances. We’ve had radio technology for less than a century. If that’s typical of civilisations in our galaxy – that they survive for only a century and then destroy themselves or simply stop exploring – then we won’t both exist at the same time, given the 13-billion-year age of the universe. We’ll only make contact if the aliens have been around much longer than us, meaning they’ll be more advanced.
But couldn’t they have our level of technology, but just be much longer-lived? Maybe that’s the key to sustainability of civilisations on cosmic time scales – relying on primitive technology that uses minimal resources. That’s certainly conceivable, but even then, the extraterrestrial society would have a stability that far surpasses Earth’s cultural chaos. Even if the aliens we contact aren’t technologically advanced, they’ll be much more socially advanced.
MEti focuses on attempting to actively message extraterrestrial intelligent life